Yes, I do not want to guess. Everything should be laid out in the ad, from stats to what he's looking for in a hump buddy, and recent pics.
I would respond to something like this (with the good bits filled in, of course.):
Attractive, sensual, single ___ male, shaved/trimmed all over, height, weight, cock size, clean, laid back, and easy going seeking _his type_. I am D&D free, only play using safer sex practices, very oral and attentive, love to please, and learn how to get you off. You must be cool with getting a little freaky: freaky thing #1, freaky #2, freaky #3, freaky #4. I'd love to _sensual, sexy goodness_.
(Reiterate what he's looking for) So, if you're looking for ___ guy for an NSA encounter, D&D free, laid back, a little to very freaky, _preferred body type_, _preferred appearance_, and want a guy to ___, I would love to hear from you.
Attach recent pics - body and cock.