The sex is warm and sometimes rises to the level of hot. Don't rent this one just for the sex though. There are many better movies out there for that. What this show does, though, is capture (to a fairly good degree) the look and feel of the original series. Evan Stone does do a very good job of portraying Captain Kirk. If you're a Star Trek fan and are interested in the idea of an X-rated version, it is worth checking out. There is a little bit of anal sex. Whether that is a feature or a bug is up to you.
Not the worst I've ever seen. Still aside from the funny special effects, scary reminiscent of the original show and the mildly humorous acting, the real let-down was the sex. Nearly every sex scene goes exactly the same way. Boring, boring, boring. Unless you absolutely have to see Kirk have sex, save yourself the boredom.