I wasn't going to post because it'd be off-topic, but then I saw something else I wanted to comment on, so what the heck, all-in.
You know what's funny? Over here in the UK at least, if I were to save your avatar for whatever reason, I could be arrested for possession of paedophilia, put on the 'Violent and Sex Offender Register' alongside rapists, imprisoned, and have my life ruined.
Actually, that's not so funny...
That's what I was about to say, that was me. At the very least every site's video needs a preview, and there's no harm in a few videos out of dozens or hundreds getting free exposure.
Sites with their heads screwed on put a watermark and/or an intro with the title (and maybe the stars) on all their videos, because when someone gets a massive boner watching a free video, the second thing they'll do is try and find out where the video is from, or who it's starring, or ANYTHING, because they want more and will be more desperate to pay for it than someone going in blind.
Add to that: Free advertising.