What's the diffrence between a blowjob and anal sex? She can close her mouth but not her ass
You don't think people can control anal sphincter?
I'm not sure what you mean. There's no difference, except that with blowjobs I can cum inside the prostitute and with anal, it gets all over the place.
Sex is normalized nowadays and people should be free to do what they want to a degree. As long as it's between consenting adults, there shouldn't be any problem. At the same time I'd suggest you not to refer women as a sex object as it's not ok.