I believe he wasn't acting; just a stand up part.
According to the Indpendant:
http://www.independent.co.uk/news/w...ump-porn-softcore-playboy-movie-a7340376.html
The 2000 VHS title, Video Centerfold, features a non-sexual segment in which Mr Trump, apparently accompanied by several Playboy playmates, opens a bottle of champagne and sprays the foam at a Playboy-branded limousine on a New York City street.
It seems more of a smear campaign which Clinton is clearly aware of. Too bad for American politics when the issues are side lined.
A "smear campaign"??? Good grief Whichy, can you get any more partisan
Trump brought this entirely on himself. HE is the one tweeting before dawn for people to go look for sex tapes. Yeah, it may be just a cameo - and thank all the non-existent gods he didn't take off his clothes - but between this and his wife's Playboy spread, maybe Donald really needs to stop acting like porn is "disgusting"