I dont know why most women do not like this. My guy had been with two other women that had pounded it into his head that it was gross and he better never do that with them. So when I came along and we had been together over three years before I ever got him relaxed enough to just let it go off in my mouth. Yeah, it took me that long to get this one pulled off because they had him so brainwashed NOT to do it. We both found out we totally enjoyed it , but, it does NOT take the place of actual penetration. We also learned that from experience too.
I believe its a good thing your g/f tasted it on her hand and realized it didnt taste that bad. Maybe if she just taste it a little bit when you first start to cum, and just keeps getting used to it.