The violence tends to get extreme in the games, but the movie will only be rated PG-13. Borderlands has been rated PG-13 by the MPAA. The official description of the rating states... Rated PG-13 ...

Nudity and sex: Yes, there is some nudity and sex in this movie. There’s no full-frontal nudity, which is why it gets to keep its PG-13 rating. The sex is shown but not in graphic detail.