Because there is a potential underlying motive, and it presents danger for one of the parties due to them being physically weaker. The risk of sending (or the other party assuming) the wrong signal is probably not worth it.
But that underlying motive could be mutual, it could not, the key is consensuality, at any point one party isn't on the same page they can and should say no, this applies to same-sex and opposite-sex configurations, no?
> and it presents danger for one of the parties due to them being physically weaker
That's also true of same-sex configurations, though.
> But that underlying motive could be mutual, it could not, the key is consensuality, at any point one party isn't on the same page they can and should say no, this applies to same-sex and opposite-sex configurations, no?
Hence the purpose of flirting to ensure both are on the same page and accepting of the risks. Consensual-ity and motive may not be easy to objectively establish in the moment, so I am guessing this is one area where societies have evolved to play it safe.
> That's also true of same-sex configurations, though.
The low probability of this, as well as the relative strength differences between an average man and the weakest man versus an average man and an average woman make it not worth worrying about, evidently.
