I am witnessing several heterosexual advances
 

It appears he wishes to mate.

Re: I am witnessing several heterosexual advances
 

Check for a bump in his trousers. It might be a sign of readiness for copulation.
What is the female's reaction to his mating call?

Re: I am witnessing several heterosexual advances
 

She bared her teeth and made rapid barking noises. Some say it's laughter, but others thing humans have no concept of "humor", and are incapable of laughing as we do.

Re: I am witnessing several heterosexual advances
 

I think it's a human strategy to deter unwanted males, but I'm not quite sure. Most of the animals bare their teeth as a sign of hostility, but I might be wrong... Humans are so weird.