I often used that method to add to my girl's pleasure, and help her to orgasm. It also had the effect of delaying my orgasm, allowing me to fuck her longer and harder.
After the implant, I can still flex my kegels, and my cock will jump around, but it no longer has the girth pulsation.
It's a bit of a tradeoff, but it doesn't bother me, since I can keep pounding as long as I want now.
