Actually, it's easier to be a slut when you're a male, 'cause you don't have to worry about pregnancy.
Of course, it's easiest when you're bisexual and can swap genders. My signature Exalted character is almost that (he's straight in his standard guy form, but female hormones combined with a guy mindset make him attracted to both sexes when a girl).
I think that's just an option some dragons take.
Personally, I think they just smirk and either scatter their hoard across the world or pull a Gold Roger.