I think he's lying about using viagra and it bothers me. After some sex sessions I've asked 'was that for real or were you using viagra?' and he always says 'no, it's for real'. But often nowadays, his cock feels like steel it's so hard and he can carry on fucking hard for hours on end. Honestly, how he doesn't end up with a red-raw knob is beyond me. He's mid 50s & I know for a fact he has used it in the past. Should I be bothered or should I just let it go?