B) For that demographic...does it work?
Because the writeups I've seen of "Why do men send dick pics" have generally concluded that "Men would quite like to see their partners genitals, and a proportion of them think that sending their own would thus be appreciated."
And when I've discussed this with women they've largely been disbelieving that (a) men want that that much and (b) any man would think it would work. A gay dating site seems like the ideal place testing ground.
Not that I expect all gay men to, well, agree on anything. But if it they're even more common, and the reaction is more likely to be "Nice!" rather than "Uuuurgh" then that would be a fascinating piece of data.
Edit: As miss_s_b points out, it's unsolicited ones I'm talking about here, being used as a dating tactic. Solicited dic pics are a wholly other matter.
Original post on Dreamwidth - there are comments there.