Sexual health clinics are your friend, there are clinics focussed on gay men, and others that have a wider remit. They have the knowledge and will be more than willing to offer you any advice you ask for, and most likely advice you didn't know you needed. I go to one run by the ACT government (it's in Canberra's main hospital), and the service they offer is exemplary. The practitioners I have seen have all been women (just happened that way, there are men there too), most have been registered nurses or nurse practitioners and one was a doctor, and all of them were quite comfortable talking about M2M sex issues. (The doctor basically told me, rather than suggested, that I was getting PrEP (for use on occurrence rather than continuously) when I had hesitated [don't @ me}.)