My best friend and roommate in college was a runner. His routine would be to go run, come back, take off his clothes ans go shower. Whenever he went into the shower, I would go into his room and rummage through his dirty laundry to find the pair he just took off.
I took so many of his sweaty pairs of underwear to sniff while I jerked off in my room next to his. I loved feeling his sweat and licking the crotch area. His musk was so strong and it turned me on so much. I wear a pair of his nike pro compressions still.