I once had a dream about going to Mars only to find that Martians were humanoids with pseudopenes and pseudovaginae that they used to communicate, using a language superficially resembling tactile sign crossed with morse.

I was sent to Mars on a mission to save Earth from a tyrannical dictatorship. So I basically had to fuck the Martian ambassador to tell them that humanity needed their help. That was my weirdest wet dream to this day - I'll turn it into a hentai comic if I'm ever in desperate need of some cash.

So yeah. I don't think there's a sexier way to talk about sex than literally having sex to do so.