Can't imagine why any guy would be threatened by a piece of plastic. :/ Especially when you are the 'operator'.
Wife really loves it when I use a dildo in her, while licking her clit. She fantasizes that I'm double jointed, and cums like crazy.
It's even better, if we do it after I cum in her first. Not for the timid I suppose, maybe a bit messy, but it sure adds to the intensity of her O!