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Trust me on this: you are not, you are in the first flush of physical lust and romantic affection. And No, you don’t know - just because he says so may mean he’s polite or he’s from a different cultural background (Hispanic?) or he may be as giddy as you are.
You haven’t said anything about your experiences and prior relationships. Perhaps you were rather alone (or lonely) before you met him. Also you haven’t said what country he’s from. 
 
I’d strongly suggest you go slowly. And in response to your questions:
Take the time to get to know him fully.
Stop paying him for his time (and services) and see how that plays out.
Do not buy him an expensive gift just because you “make a lot more money”. Rather, you should get him a thoughtful gift (maybe a book he’s wanted to read) - something that shows you’ve listened to him and thought of him. See if he reciprocates. 
 
Bear in mind the golden rule - everyone behaves at their best in the early meetings - so see him in a variety of settings, watch how he handles other people, ask yourself if he’s kind, and check online that he’s honest (there’s a lot of information online so check that what he tells you is accurate and truthful).

I love it both ways, but my favourite is to be the one doing the rimming. 
Having my tongue licking and digging deep into a hot guy's hole is just insanely erotic for me, and drives me wild.

I love it both ways, but my favourite is to be the one doing the rimming. 
Having my tongue licking and digging deep into a hot guy's hole is just insanely erotic for me, and drives me wild.

This made me chuckle 😂
So true though.

Agree. One of the reasons I ended up deleting that app from my phone is because most people on there are flakes who just want to 'sext' and have endless chat. 

Naked 🤭

Agree. One of the reasons I ended up deleting that app from my phone is because most people on there are flakes who just want to 'sext' and have endless chat. 

I wouldn't even mind that as much as the constant requests to see photos of my erect penis ( and then asking "how big is it" ) after they've already SEEN it ! 😳

Which is the basis of my question.
Since humans seem to be able to manage sexual relationships with either gender when left with no choices, it is a reasonable conclusion that there is a degree of sexual flexibility more than people usually admit to. Naval ships are known for their homosexual activity, as are prisons. Extract the choice, and you make do with what you've got.
So yes...bisexuality does seem to be a default setting for the majority of humans.
That's why I was asking how many gentlemen here felt they were absolutely never - ever attracted to the opposite sex and how many have dabbled in both, ultimately choosing a preference. 
For me it's all about the person, not the "parts".

I personally believe most if not all men are bisexual, to some degree or another, no matter how minuscule the degree to which one is might be.
I think most people who choose to identify their sexual orientation as either 'gay' or 'straight' do so based on their predominant attraction to either the same or opposite gender, respectively; but that ultimately, there is attraction to both genders in all of us (or at the very least, the possibility of attraction to both genders, whether we choose to acknowledge that or not).
How one chooses to express, if indeed at all, their bisexuality is also extremely variable, and many people (if not most) probably don't realise they are bisexual since the way in which it is (or is not) expressed doesn't seem bi to them.
Perhaps there genuinely are people who are 100% one way or the other, but my guess is that such people are extremely rare. I think, for most us, our sexual orientations are a sliding scale or continuum (of bisexuality). 
In my view, nobody chooses their bisexuality - since that bisexuality is just the natural default setting of human (and, indeed, other animal) sexuality. But what people do choose is whether or not they identify as 'gay' or 'straight'; a choice they make based upon their predominant attraction to whichever gender.

This made me chuckle 😂
So true though.

I love it both ways, but my favourite is to be the one doing the rimming. 
Having my tongue licking and digging deep into a hot guy's hole is just insanely erotic for me, and drives me wild.

I suspect that your family's reaction to the joint announcement may have resulted at least somewhat from the fact that other people wouldn't necessarily know that you were gay, but everyone could see that her boyfriend was Black. Many families certainly used to feel that it didn't really matter so much that you were gay as long as their neighbors, friends, co-workers, etc., didn't know. I remember when I was in my late teens that I realized that my father's cousin Fred was gay, but not out in any public sense.  I also realized that my parents knew he was gay, Fred's mother, aunts and uncles all knew (they accepted his close "friend" as a family member), but they never acknowledged the fact except within the family.

51 a/b
http://media.sexflexible.com/2014/10/Alpha_02.jpg

 
52 a/b
http://galleries.gaydemon.com/7/e/700f67133af125e1de9bd5e7a0a7f6ce.jpg
 
http://galleries.gaydemon.com/a/9/af821e2633d08910baac5fc3b8e3b6c9.jpg
 
53

34

 
35
http://67.media.tumblr.com/dac3ee86fc4a53c32091a1c3ff2019bc/tumblr_nk7x3zhpjI1snz78ko1_1280.jpg
 
36

In ads, escorts seem more inclined to exaggerate their height than their weight.

You're right. A lot (even perhaps most, I have to say) of the Brazilian escorts currently working the gay escort scene in London are into playing with chems (usually 'Tina' and 'G'). 
I think they tend only to use if the client also uses, though.
All the escorts I've been with who use chems have always respected my decision not to partake, when they offered me. I have never felt pressured or rejected because I decline the offer to do chems. And most have been OK with not taking any chems themselves whilst they are with me, though I have no problem with them using if they want to, as long as they don't mind me not using.

He looks a lot bigger than 120 lbs if he is 5'11"

I'm pretty confident his post was completely fabricated. 

I can't speak to how high-class he might be, but he's damn pretty.
Those Brazilians !!
God definitely added some extra sexy to the gene pool down there.

I had been hiring a guy a while back a few times and he told me he was 35 but advertised 28 because he could pass for it. I guess it matters to some guys. As long as he can perform and we have a good time, what does age matter if I’m satisfied?

It really does vary. Sometimes I will have three sessions in a single month or sometimes only one or even none.
Sometimes I'll have a consecutive run of several months where I hire (at least once a month) for every month. Then I might go through a period of a couple or so months where I don't hire at all. Or I might hire one month and then not for the next four or five. 
With me it really is extremely variable and without any kind of consistent pattern.