system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do girls like the smell of my sweat?

I've had several girlfriends really like how I smell after I work out; literally smelling my body and armpits. I think it smells gross. What gives?
gpt
Your sweat smells like *you*, and your girlfriends like that.  You probably like what they smell like too.

One thing dog owners do sometimes, when they leave their dog for a while, is leave some of their dirty laundry, since many dogs find their owner's scent reassuring.