For example a female renting out rooms in her home may not want to rent to men for privacy reasons. 

The tenants (both) were warned that if it happened again, they would be billed for the plumber visit (note: both tenants are female, but I have my suspicions about who is flushing products).Well, surprise surprise, it happened again EXCEPT this time the tenant (the one I believe is flushing products) called Code Enforcement instead of calling me. 

I was the first female moderator by the way!!

It's riskier for a female agent or PM to show alone to a male prospect.

The lease I inherited indicated there was only one female tenant.

As a young female, I'm reluctant to go to the property alone, if that says anything.I hope this small tidbit of knowledge helps!

Males had a median income of $28,420 versus $20,967 for females.

Then I asked my kid to turn the snake over , I tell him its only a female .  

I would argue men's ability to absorb risk is actually why you see more male investors and younger male investors than you see female investors... so I don't ascribe to not entering because there could be an element of risk.

BTW, I think it shows a lot about you that you just publicly thanked 4 people in the post above this, but only the female got the up-vote.