So I've been having a sort of problem that I think you guys might be able to help me with, or have experienced. When I'm having sex or masturbating, sometimes I get a sensitivity at the tip of my penis that you get after you've ejaculated, except that I haven't, and I lose my boner. Sometimes it happens when I'm trying to hold back the load, sometimes it happens spontaneously, other times not at all. I don't know if I explained this right, but has anyone else experienced this? And there a way to "fix" it?