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The idea that a woman can easily find sex with the man of her choice is a false one. Period. It is also true that indiscriminate sex can be dangerous to a woman, so that's one reason why she may not engage in it. I can anticipate that if she's willing to take that risk, she can have sex. Ah, but that's like saying that we all have access to hundreds of thousands of dollars -- because one can always rob a bank. Yeah, it's risky, but it's an opportunity.
IMO men do have advantages when it come to indiscriminate sex. There's no social mandate for purity -- in fact, society encourages male promiscuity. There are fewer physical risks (that he'll be beaten/killed by his female lover). A man can evade the consequences of pregnancy. He can go to more places alone without comment. There are a host of advantages.
I don't get the point of this particular sub-topic that often is brought up by men who feel that they aren't getting their fair share of women, and that the women are denying them unjustly.