Girls Casual sex yes or noWatch
I think you will find plenty of girls that do have casual sex/would do it then you will find plenty of girls who wouldnt take part in casual sex and only have relationship sex, its all down to a individual not gender in my opinion. Same with guys not all guys are looking for just sex. Stereotypes can cause you to judge unfairly.
Imagining I was single (for argument's sake), atm I'm very neutral about casual sex. I don't think I'm missing out on it, but I feel no strong disinclination or moral objection to it either.
I'm quite sexually confident so I don't think nerves or shyness would hold me back if I was single. However, I do feel that I want to have some kind of a meaningful connection, remain safe and get decent sex where I orgasm. I'm not sure casual sex with a stranger can fulfill those criteria!
But casual sex with a friend, would risk developing feelings and getting into a mess.
Therefore the only kind of casual sex I can imagine getting into, would be sex at the beginning of a relationship / in the dating stage. Where I have a connection with someone I can reasonably trust and will "look after" me but where it isn't compromising a friendship. But some people would say that's in a relationship, rather than "casual". I'm also wary of this as I know there are people who fake feelings/ a connection just to have sex in the dating stage. If this happened to me I'd feel pissed off, not for the sex, but for the being fooled about the prospect of a relationship. Whereas, though it may be a crude test, you can use withholding sex to weed those ones out quickly.
No sex is completely safe.
Sex in a committed relationship is the safest.