This is why The Woman had no chance with Sherlock Holmes. She wielded her sexuality as an additional weapon to surpass him. She cheated and brought a gun to a sparring session.
Eggs are expensive and sperm are cheap. This is a generic rule for the majority. Funnily enough, when a woman mates like a man (sleeps around) she is being treated exactly as her behaviour implies, namely, that her reproductive standards are cheap – like a man.
The true double standard is expecting to be treated as a good girl while acting like a bad one.