unfortunately gerth/size does matter if....your swinging partner is "Pencilsize" than gerth/size does matter. My man is no Superman, but he is average size 6 and gerth size of a 50 cent coin. We shared a wonderful time with our playcouple prior to, but as we became more intimate I could not concentrate on anything other than my partners gerthsize. His wife was completely satisfied as she rode my husband like a bucking bronco until she finally screamed with pleasure. Watching my husband and his wife was completely satisfying. I did not want to be mean and I rode my partner until he came and thanked him polietly.