I used to live in an apartment in my early twenties. I had no serious girlfriends, but dated a few women, and had a couple of female friends. These friends would often stop by unannounced for a visit.
One woman who I had dated came by one day, and was upset with our relationship. We had gone out a few times, she was great, but not my type. Besides, I was not looking for a relationship at that point in my life. We ended up in an argument that she ended when her knee mashed into my groin. She left after I fell to the floor in pain.
As luck would have it, a female friend came by only a few minutes later. I let her in, and she noticed that my face was flush, and I was in pain. I told her what had happened and she led me to the couch. She went and got me some ice in a towel, and instructed me to strip to my underwear. I was embarrassed, but followed her request.
She handed me the ice and told me to put it over my scrotum, outside my white briefs. She sat in a chair and consoled me emotionally over the argument. She never looked at my groin. After about 45 minutes, she took the ice and got rid of it. She asked if I was OK, and asked if I wanted her to see if everything 'worked'. Not believing what was happening, she pulled my underwear down and massaged my balls until I had an erection, then began stroking me until I dribbled out a few drops of cum, followed by a shot that landed on her cheek. It was our first and only sexual encounter, and I have never had an orgasm like that since. If that's what it takes, forget it, it hurts too much.