Okay, this is going to sound weird and disgusting, so if you feel like making fun of me, please keep your comments to yourself.
I personally think they do.
I don't have a problem with ephedrine, but when I use Adderall (not for working out, I have sever ADHD) I get an ejaculate response where I will drip cum but not orgasm or anything like that just reading, eating, etc.. with no stimulation or erection. Pseudoephedrine aka Sudafed does the same thing...
Pseudoephedrine is used to make amphetamine and Adderall is a combo of 2 amphetamines.
Anyway stimulation of the prostate by the chemicals is what my urologist & doctor feel it is...this does occur amongst other men, a lot are embarrassed, but I don't care!