While the game looks rather harmless and doesn't show much, it's novel-length written alien interactions can imply a hellover lot of things. From unethical experiments on living beings over slave trade to the mentioned sexual topics the game has very colorful descriptions, innuendos and implicit hints.
A bit more info on the sexual themes:

One alien race is basically a slaver race with rather dominant female members of their species, which is accompanied by a hedonistic and sexual lifestyle. Looking at the achievements reveals, they also run an alien pleasure temple. Another quest has you crashing a party of them, basically, and you have to get the host drunk for a heist.

Crew members can, depending on the crew you assemble, imply they'd like to start a friends with benefits relation with other crewmembers.

One of your crewmembers can up as an adult movie star for aliens, kinda.

Oh, that's pretty different. Thanks for the info!