Re: Adult videohosting ?
Both Pornhub and Xvideos have embed options. Pornhub might be the more versatile platform (not sure if xvideos has HD-support), though I don't know too much about them.
I do know that Pornhub is owned by the same company that owns Redtube, SpankWire, Tube8, Youporn and others, so I expect them to work somewhat similarly in terms of tech.