Okay, so I was having sex with this woman, and I got an eretion and we started, but I kept going soft during sex. I am 28 and this started about 6 months ago actually, the past 4 partners I have had this has happened, and it's been embarassing to say the least. I used to get an erection by just thinking about sex, now I can't. I seem to be in fairly good health for my age. Can anyone recommend any solutions?