Both are. The virginin meme -the woman's worth is determined by how many sexual partners she's had and the slut-meme (if you don't put out on the 2nd date I will dump you).
They're two sides of the same coin - misogyny. What they have in common is that they don't see the woman as a human being but only a fuckhole.
The first one believes any woman that ever had even 1 boyfriend come ner her fuckhole, she is "used up goods", "trash", "a roastie". While the second one is worse at delaying gratification and want's to get in ASAP, sperm and then leave. Both are two sides of shit.
Porn sucks because it just reinforces the notion that women are fuckholes. The problem here isn't "slut culture" or "virgin culture", but that men are obsessed with women's sexuality and don't see them as human beings.