I have always liked bull terriers, rottweilers, pit/bully mixes, and great danes. I have been around all of these breeds, (playing, not sexual) and I find them to be very attractive. I've also been around jack russels, labs, retrievers, dachshounds, corgis, and tons of GSDs, but I never viewed them in any sexual manor. The odd one nobody seems to mention is greyhound, but that's likely due to health issues/availability. I used to play with one as a kid, (not sexual) and he was so much fun. Talk about zoomies! lol. My next dog (whenever I am ready for one) will absolutely be a great dane, but that has way less to do with his penis size, and more to do with having a partner that is about the same weight/height as me.