My GF is a petite Asian, has never had children, has a small and tight pussy, and said my cock was the largest she had ever had when we first got together. My cock is average, about 6X5 inches. When we started swinging she complained about getting sore if she had sex with any guy slightly larger than my cock. However, I found that her pussy got looser after she had an orgasm. From then on I made sure that she had at least one orgasm before any cocks slid into her pussy. After we had been swinging for four years, we got together with a guy who had a 9X6 inch cock. We had a great experience with him. He and I worked for quite a while to give her a very strong orgasm; and when he worked his cock into her pussy she found she could take about 7 of his 9 inches. After that session she decided to try anal, and he slowly worked all 9 inches in her. She loved it!
Since then she likes for me to find guys with 8 or 9 inch cocks. Over the past several years she has worked up to taking all 9 inches and considers herself as a size queen.
However, by the next day her pussy is as tight every time as it was before she fucked each big cock. And, my average size cock apparently satisfies her. As some folks have said previously in this blog, emotion plays a big part in good sex. When we swing, the sex is for fun, sport, and excitement. However, when we have sex, it is full of emotion, love, and commitment.