Well I've been wondering about this - people are saying it would be harder with a male, but I figured it could be done just as easily.
I wanted to try this with my slave because we both find the idea very hot indeed.
I don't know how it'd feel for him of course, but I figured it'd be pretty mean if I could actually make him come in public - it's messy and obvious. I know the ejaculation can be isolated from the orgasm but is it possible the other way round with men?
I am a noob in this subject, but very interested and I'll keep watching this thread.