Lately it’s been just simple Caffeine for me. Works okay, definitely adds to the feeling when playing with myself, especially with dildos. The sensitivity and energy are really welcome! It’s not a super intense experience, but I like it, it’s refreshing.
In the past I’ve had sex and masturbated combined with Cannabis pretty often and I think that’s more or less my favorite. When not overdone, the relaxation, extra sensitivity and immersion make for a great session. Just being there in the moment and enjoying it, so lovely! At some point even just the smell of Cannabis got me a bit aroused. Now, keep in mind, it really depends on the person, the current mindset and again I want to emphasize, if NOT overdone. It can be a thin line between an amazing experience and a shitty one, so respect the substance! Never tried it with edibles, it was always smoked.
I’ve tried masturbating plenty of times with Kratom as well, but after some time I realized it’s not really worth it. I get aroused at the start and playing with myself feels good initially, but as the effects progress it becomes dull quickly. Other people might have a different experience and I think I was just dosing too high.
Edit: An update on Kratom. I recently tried a lower dose (2-3g) combined with an Espresso (lower dose Caffeine) and it works quite nice. Now, keep in mind I have tolerance to Caffeine and experience with Kratom, so I wouldn’t recommend it for your first time. For some people this combination might not work very well, so do some research. For me both substances compliment each other quite nicely, even though it might seem they would cancel each other. Kratom in lower dosages gives a nice mixture of relaxation and mild stimulation, while the Caffeine boosts the sensitivity and mixes with the Kratom stimulation. It’s a very refreshing experience when masturbating on this combo.

I’m sure! Alcohol usually didn’t work well for me, but it’s different for everyone.
Yeah not too much alcohol for me but just a nice buzz definitely enhanced things for me. Maybe not in sensation but in just overall fun mood.