First, I hope you are ready to be called "dad." Unprotected sex is primarily intended to promote pregnancy.

Most men, especially youngerones, come pretty quickly. As a teen, I always jacked off my partners as part of foreplay. Slowed them down and got me what I wanted. Inspite of this, do not have unrealistic expectations of bringing her off through thrusting. Most women do require some additional stimulation by hand or mouth. There is nothing to really slow you down unless you want to try the squeeze technique. Put that in Google and you and your girl read it it. It requires her cooperation and assistance. It is fun.