I like chem-sex too, in the smartshop they sell several kinds of aphrodisiasic psychedelics, they also sell sex opium (which is a tincture with herbs that give an opium-like buzz and enhance touches, etc...), and lots of other stuff...
With coke however I find it hard to get an erection and even harder to reach a climax...
The same with amps...
Crystal Meth was great for sex, besides that I would end up with painful friction burn...
A joint also is nice for intimacy...
I used poppers in the past as well...
I get my biggest kick not out of drugs but out of other things when it comes to sex, the biggest kick I get out of rape play, like having to overpower her and stuff, rip some clothes to shreds, yeah I like it rough...
Other role play can also be very kinky, as well as having sex in public places (where someone might see you, however I prefer not to be seen...), going to sex clubs can also be fun, watching your partner have sex with another guy can be quite a turn on, as well as threesomes (I only do f f m, I cant get myself to do m m f), sexy lingerie is a must, also toys are fun (I bought these panties for my gf with a vibrating egg on them that is controlled by a remote control, its fun and kinky to go into public together while I have the remote and make her shiver with pleasure the moment she is a conversation, or on the bus,...), we also film ourselves and put the movies online, we both have some exhebisionistic tendencies, and so on...
But the great thing is that my gf and I are completely on the same level regarding all those things, and dont forget, this is Amsterdam, we are very openminded when it comes to sexual affairs...