I myself have never gotten into a relationship based on penis size, however I do know a few guys who say that size is a major factor for them. They say this but I don't know if it's really true for anything beyond a quickie.
For me it's always been the initial appearance of a man. Something grabs hold of my insides and starts my heart a-twittering and there it is--INFATUATION. Good old fashioned lust. I have never based it on a size of a guys penis (although a nicely prepared package can grab my eye it won't hold me for any time). Over the years there have been small, average, large and huge but the physical attraction for me was always their body structure. A little on the heavy side-hefty or husky as it was once called and preferably a little taller than me (within reason). A furball always works for me, hairy arms, legs, chest etc. and I'm hyperventillating . Some whiskers on the face and I get extremely light headed. Bald is okay as well as full head of hair, although I'm not a big fan of long hair on men. Strange how the issue of genital size has never been a concern to me. I may need some psychotherapy to figure out what that's about.
Now, putting all that aside, there are other matters as well when it comes to serious relationship wants. The guy has to have a personality of some sort. What would the purpose be to a 14 incher if the guy was brain dead or a vapid asswipe?
I've been with one man now for a few years (and don't anyone get started again on my sideline oral romps with others-Ray knows all about it and it really is nobody elses business no matter what others may want to say or think) the point here is that I was never attracted to this guy for much in the way of physical attributes. He had a thick mustache and a smile and a certain charm. Somewhere about a year after we first moved in together I was looking at him one night and asking myself why him? Here was this pudgy, fat bellied, barrel chested, scrawny assed, bald guy who was 3 inches shorter in height than me (and I'm not even an average heighted man) who had bad breath and yet I was in love with him. It registered with me that it was who was inside him. His soul and charm. His this and that (especially his that). His caring and acceptance of himself even his occasional faults.
No, I can't say that penis size was ever a factor.
(And for the record Ray got his breath problem cleared up after he went to a dentist who a little too happily pulled his teeth. Who knew rotting teeth could cause bad breath?)