This has happened on many occasions. I'll start with a girl and have a quick orgasm during the first couple times we have sex. It eventually goes away and we can spend anywhere between 30-60+ minutes having sex. I get comfortable enough so that I can last longer, which feels better for me in the long run anyway. (Emotionally and physically) BUT, whenever a new girl comes along the cycle begins again. It seems like I have control over the time I cum but then I feel like I throw new girls off by my short orgasms. Has anyone else ever experienced anything like this?