Oh I thought you meant she was supposed to do the duties...
Well, still a man's tongue aint the same thing as the real thing...
The general rule is
long and thin, farther in
short and thick, does the trick
i think it's the overall pressure on our "lips" and sensitive clit that does it, not just vaginal stim, it's actually the difference between getting hurt by too big (long) and feeling the greatest intimacy with the average size
but honestly, the girth is nice...It's the pulling and tugging as well as the pressing in on the cervix that's the best--pressure with the penis, balls, pelvis everything, not the foot long hot dog that only bumps the cervix during the drama points sending us howling in pain, the rest of him can't even reach, it's like being poked with a broomstick not making love ---if he's average and slamming away no problem...But those "gifted"guys remind me of horses and it's really kinda gross when it gets that big, they should have meat reduction surgery probably ;0