>>21522056it's mostly for psychological reasons. women know that guys like it when they're being submissive to the guy and cause they're doing something nasty and perverted. for some people the psychological aspect is more important than the actual penetration.
and yes, they can cum from it because if you're penetrating a woman's ass, to a degree you're also stimulating her pussy. that's why some women like really big things in their butt.