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Before feminism (and the pill in the early 60s) people didn't spend such a large period of their lives finding mates.
Young men didn't have sexual access to young women until they had a job and could support a wife. If they broke those rules they could expect a shotgun wedding. The young woman paid an even higher price for casual sex -- being forced to give up a shameful baby for adoption.
So young men can thank feminism (and the pill) for more casual sex, not less. If you marry young, you will have more sex and better sex in total though.
For many young women (unlike gay men) casual sex with strangers remains undesirable. All your future babies are put in danger by a whole range of STDs.
And self-named "nice guys" often aren't. They are going after girls who are not in their league. And that's only one reason why girls want to get to know you.