I really like stims. They usually make me want to stretch out my hole, and they shrink my dick. That really turns me on. Then there's booty bumping T. There is nothing like it. T is not a requirement though, since getting spun usually means a time commitment. It's a 3-day weekend thing for me. My stretching progress has mostly been done with some poppers and a couple of Sudafed or completely sober. I make an effort to do a lot of loosing up before I do T, and while I'm spun I don't try to push my limits.
One thing I have decided to never do again is G. I had a hot mutual FF session for my birthday a few years ago where we both did T & G, but my memories of it are just random images. There are no gaps in memory or anything. It's like I was watching it on low-resolution video.
BTW, if you really want to enhance your T-dick or just keep it from getting hard, squirt some Afrin into your urethra and rub some into your dick. It's a vasoconstrictor, so it really shrinks it down. If that's your thing.