I think what he's getting at is, does it smell like ass? This gets my attention because it's a stereotype I think a lot of straight people have about us. My answers would be:
1. We don't ALL engage in anal sex, so if you're asking if our dicks smell like feces, the answer is absolutely not.
2. It's the norm to use a rubber (as far as I know and hope), so a dick might smell like rubber if it was inserted into an ass, as someone said.
3. Even with barebacking, most guys on the receiving end of anal sex make sure their ass is clean, very clean, before fucking, so again, no foul smell.