Guys, Why would my guy friend ask me to watch him masterbate all of a sudden?

So for context, he's way more sexually experienced than I am, and has a few girls he gets with on the regular on speed dial, yet he messaged me all of a sudden and told me he desperately needs to release a loaf because it's painful for him to have that build up and begged me to face Time him while he did. I still don't know how to respond to this since we've been good friends for quite sometime and I'd hate for this to ruin our friendship.

Guys, Why would my guy friend ask me to watch him masterbate all of a sudden?
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