At strip clubs when men pay for lap dances, do they sometimes get erections and is it perfectly ok for the woman to dry-hump his cock?

(edit [NSFW] sry)

I'm a woman and I've never been to a strip club and never will, so whenever I've idly heard about lap dances I never thought much of it except for her titties in his face and the pointless sexual frustration and his waste of money

but now for the first time I'm thinking

ohmygod if he had a huge cock and she's all teasing it through his jeans with her g-string-clad wet pussy that is kinda so hot and maybe that's worth the money for him

Because I also know that the women are allowed to touch the men, but the men aren't allowed to touch the women

which brings me back to the opinion of how stupid & pointless & frustrating & stupid the whole thing is

but my only question right now is:

Does she dry hump his erect cock?