In my limited experience, it's a woman to woman thing on this as well. Some women I wouldn't want to titty f*ck even if they offered to do so, but recently, I did find the experience to be very satisfying and it was erotically instigated by the woman. She knew what exactly what she was doing and as I ejaculated, she flinched, understandably not knowing where the projectile of semen was going to shoot out and wind up. Not to mention how much and how fast I was going to cum.