Some times chicks just need to get an orgasm, unlike us guys they can grab whatever is close by and shove it up their cunt. See babes fuck dildos, machines, baseball bats, food and much more stuff.

This niche could have been called masturbation since that is the basic idea. However given that these sites are mainly focused on insertions of different objects into the pussy and that most women masturbate by stimulating the clitoris, insertions sounds better.