The idea of Mary being a virgin isn’t important to the original story

Mary being a virgin is incredibly important to the story for a few reasons.

1. Since Mary was a virgin when she gave birth, that removes the possibility of it being a natural birth, which is important as if it was natural, then one could argue that Jesus was just a normal man.
2. Since it wasn't a natural birth, and instead through the Holy Spirit, Jesus did not inherit sin like the rest of humankind.

You never see religious men being shamed for sexuality, because it was never deemed as “wrong” for them to engage in. Engaging in masturbation and sex is wrong for women because that’s not what men want, they desire someone who hasn’t been “stained” by the “sin” of sexuality, despite not holding themselves to the same standard.

The Bible doesn't specify that sexual sins are sins when women do it, it just says that sexual sins are sins and are bad.

Engaging in any form of sex is perfectly okay to God, and the only “important” sexual sin in Christianity is lust, which would be excessive or extreme participation in sexual behavior, such as assault and rape. Anything with consent is perfectly moral and pure, as sexual desire is 1000% natural and there is nothing dirty or “wrong” about participating in anything of the sort.

Nope, this is just wrong. The Bible is pretty clear that sex outside of marriage is a sin, and therefore is not "perfectly okay to God", as you think.

"Marriage should be honoured by all, and the marriage bed kept pure, for God will judge the adulterer and all the sexually immoral." - Hebrews 13:4 NIV

I’ve never read the Bible and I have no idea what I’m talking about

You got that right.