She uses the hand on the base of the cock shaft as her restraint on your cumming too quickly. The cock ring and tied balls can do this more effectively.
One rule that I always follow is never to have sex (even a wank) with a female who has a large part of her body covered in tattoos. A discreet tattoo on the ankle or small one on the lower stomach is normally acceptable, but more gets the alarm bells ringing. If they cannot respect their own bodies they are not going to respect yours. Also, large-scale tattooing is often a sign of a troubled personality and that is the last thing you want with any female.