I love a big one. depending on prep and how I feel will take water lube of spit. There is excellent grip when cock enters ass than saliva dries. Saliva usually tries fast making the friction between the ass and cock pleasure. Top's cock is not exactly locked in place but has firm grip inside the bottom's hole. I do need poppers to start with getting pounded only with saliva as lube. Need to practice more taking a dick without poppers.
Water based lube is great also accomplishing similar thing as saliva.
when I first started bottoming would only use silicone based lube. When I top I use my saliva or water based lube. Silicone lube is only good for very kinky