It feels natural to use another man's cum as lube when we're sharing pussy— almost like this is exactly what our dicks are made for in these group sex situations. It's a uniquely masculine bond between sexually leading edge men unashamed to be men.
A lot of the men into swinging and wife/gf sharing have curiosities about other men’s bodies and especially their dicks. Some use the vehicle of hotwifing to experiment with and view up close and personal the human male penis in ways they typically can’t.