That would happen to my ex alot toward the end of our relationship. He would be fine while I was blowing him but then when I'd either go to ride him or I'd get on all 4's by the time he'd go to insert he'd be limped than limp. And when I suggested using toys in front of him he would get all disgusted. No loss on my part since he was only about 3 inches long hard and not thick at all