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Bump. Through my searching the closest thing I've found is Hell Comes to Frogtown, which features a post-apocalypse society and has a plot concerning sexuality and even sexual assault, but I have found no mention of virgins or any scene like the one I remember. I've tried looking through post-apocalypse tropes and also virginity tropes such as Virgin in a White Dress with no luck. The white costume is something I remember most clearly.
Warriors of the Wastland/New Barbarians? https://www.imdb.com/title/tt0084424/
That looks like the cheap b-movie style I remember, but I don't think it's the one. I can find no mention of a scene like what I remember. I have continued looking myself, and it seems there are so many cheap post-apocalypse movies that I'm afraid I can't narrow it down much more, since I'm not even sure which decade it's from.
I don't remember where I saw this, but I think it was a 1990s or 2000s film, possibly 1980s. I must have seen this over ten years ago. It looked like a very low-budget B-movie. The costumes looked very cheap and the acting was terrible. The introduction showed a post-apocalypse kind of society where men hunted down virgin women. The women were stereotypically dressed in all white costumes. The men were hunting the virgins to use them for trading (for slavery or forced marriage). I remember a man chasing a woman (dressed in white) through a desert looking area with dirt and boulders. She was desperately trying to escape him. He caught up to her and wanted to rape her instead of capturing her, which would have ruined her value since she would no longer be a virgin.
I only remember watching a few minutes of the beginning and I thought it looked like a terrible film so I stopped watching. Since then I have grown a certain appreciation for low-budget B-movies so I'm interested to know what it is. It is possible that it was one of those "skin flicks" they used to show on Cinemax, Showtime, and HBO late at night in the 1990s and 2000s, but really I could have seen this anywhere.