I have a strange urge to sniff nerds.
Why do you like sniffing nerds?
I love the way they smell.
It's totally inappropriate to sniff people against their will. If you continue to do so people will think you're creepy and won't want to be around you anymore.
Why don't you try to understand where I come from. I need a nerd to smell sometimes.
I am trying to understand where you're coming from, but you need to understand that sniffing them will make them uncomfortable. I would try to get rid of this habit before it becomes an issue for you.