What female competitive swimmers are prone to is stiff muscles in the hips and buttocks, and for those with large breasts, the lymph nodes around the décolletage are stagnant. This is where you need to focus on massaging and releasing them. Of course, there are important pressure points on the nipples, so make sure to stimulate them properly. Vaginal stimulation is not enough with just your fingers, so it's more effective to use a penis, which is more familiar to the vagina.