Duke610 says:

Ask yourself this: If both of your arms were broken and in casts, would you let your best friend jack you off? Or, if both his arms were broken and in casts would you jack him off?

Uhh, no, actually, I believe the straight guy whose arms are both
broken would call his girlfriend and ask HER to do it.

This situation (straight guy friend whackin' with his buddy) never
entered my world, either. Nice fantasy.