Ok, not sex related but still funny....
A female friend of mine that sometimes spends the night (we don't have sex but she sleeps with me sometimes) came over one night and she had a skirt on. She wanted to change clothes into something easier to sleep in so I told her to go get whatever out of my bedroom to wear. She came back with one of my T-shirts and a pair of my boxers.
Now these boxers are what you would call a "cum rag" to clean up after my furious masturbation sessions. I don't think I had washed them in like 2 years, lol.
I could only imagine the crusty all over them.
She never said anything and I was too embarrassed too.