i'm honestly surprised by this response at first but then you told me you like older guys before. It makes sense because their feet seem to shrink as they age.
The ideal size for the average woman is a size 6 shoe. Smaller is better for women.
I wear 10.5 which puts me 10-11 depending on the brand. I suppose the ideal size is whichever is the most common so that you don't have any problems finding shoes.
If we're talking on a guy, I'd say bigger (can be) is better. My one ex has size 12 and I swear I would wash his feet with my hair. Beautiful feet. I've also gotten with a guy with size 14 feet and he slapped me around with them for my birthday last year. Since it's a sexual thing with me, I'd have to say greater than 10. I've met a couple of small footed guys recently and it just didn't do it for me. Of course the overall shape and stuff of the foot can trump size but I'd still prefer a larger foot to a small one of equal appearance
It becomes a problem finding shoes at around US size 14. You probably wouldn't be able to find anything decent in that size at Walmart if they had anything at all. You'd be going to Payless or Foot Locker or something. US 15 and up would be increasingly hard to find. You'd be stuck with special ordering or something of the like. So few people have feet that big that it wouldn't make any sense for a retailer to use shelf space carrying them