Social construct, absolutely.
I remember having many, many conversations with my girlfriends about when to “give it up”, when was too early (=slut), too late (=prude). What girl kissed on the first date, what girl went all the way etc etc. We also constantly discussed and hated on our bodies.

Guys’ behavior never went through this scrutiny, because consensus was just that guys always want it, are always going to say yes, and can say and do just about anything (to you and about you) before and after – and they are never called any names.

Of course all of this will affect if a girl wants sex, in which situations, with which people. A girl is taught to second guess every detail of her desires, her body and her sex-life from the start.
I hate this world 😦