I believe this applies to both male and female.

This is all my own personal experience & anecdotal so I don't have a lot of scientific information on this.

Generally, people view a 8 or 9 as more "attainable" for dating, so they get reached out to more.

For women, they enjoy the power of knowing that they're (slightly) better looking than their partner, but that their partner makes up for it in some way. This is why I see a lot of common pairings of male 8-9s and female 10s.

Male 10s seem to have more trouble locking down a partner (or actually do cheat and won't be stable). It could be that they don't find anyone equivalent to them, and just keep looking forever.

Female 10s will still get a lot of messages & get hit on a lot, however less than a female 8-9 due to men's intimidation. If men feel she is arrogant or unattainable, they won't bother to reach out.

So my theory is that the perfect attractiveness level is an 8 or a 9.