I always try to have a nice little stash to be able to make the men I have sex with go "wauwzers!".
Especially when they're entactogen RC's like 6-APB pills, that I'm not too fond of myself. Two of my partners are wild about those.
I sometimes worry I might set some of my friends (don't have sex with everyone I share with, but almost everyone yes) on to a path of lifelong addiction troubles.
Most of my gay friends are not interested in drugs, however.
I have a nice collection, but sadly most of the interesting RC's are banned in The Netherlands now.
Some of the guys I have sex with have a habit of base coke. I always take plenty of money with me (more than we'll be smoking) or other interesting complimentary drugs with me.
For chemsex you either bring your own drugs or money (often b.y.o.d. is preferred). I try to have both with me + erection pills + condoms + lube.
I used to have a bulb, for cleaning out, but I threw it away.
Gay sex -my kind- has to be prepared well for it to work well.