African Grey is 100% love or nothing.

I have an African Grey, who's 20 years old.
I believe he's male, never laid an egg and definately has a preferance for the ladies.

When it comes to interaction, he is all, or nothing.
I'm the only man he tolerates, but he's either full on horny, heart wings and panting. Or he's biting, he starts off gentle, but bites progressivly harder in a clear cut message to leave him alone.

When he gets horny, I walk away because I don't want to encourage the behaviour, but I've been doing that for other a year.

Any tips on how to get him to chill out?