Iit that i like the smell of my partner's bo?

Almost all women like the smell of their man. Many will nick a shirt and wear it around the house when he's not about.

I think its an animalistic kind of instict.

This is an evolutionary survival tactic. When you like the smell of someone's BO it means their immune system is the opposite of yours. This makes it so that you want to mate with them and it makes offspring stronger.

When you find that you like someone's natural scent, it means they have an immune system that's structured very differently from yours. That means you have a much better chance of producing offspring with better immune systems by combining the strengths of both of yours'. It's really just science.

You should smell his balls and get back to us....