I blame circumcision...
Yeah I know, sounds like a troll in the women's forum, but hear me out:
The procedure removes motile, girthy and very sensitive flesh from the male organ, also depletes it of more than what they think now is about 50% or so of it's sensitivity. (there are a ton of numbers tossed back and forth on the subject, I just drew a safety line down the middle) This girth also is PLIANT and the "rolling" effect of the shaft slipping through it's own tube when envaginated literally adapts to the walls of the woman's canal.
So men get lopped and clipped, basically Bobbitized from birth. And as revenge, take it out subconsciously on women having to invent weird things to compensate for sensory and natural, pleasantly fulfilling tissues that are lacking and help accommodate and make the experience pleasant for all parties involved.
If men stopped tinkering with the natural design of the penis, I would think that there would be far less conversations in this vein, and frankly - useless surgery visited upon women in an attempt to compensate for an unnatural failing brought into the equation by men with surgically altered and STUNTED penises.
I will now, quickly, fade into that shadow over there - let the tomato tossing begin!