I’ve used the following method a number of times with very successful results: 1) The woman must be ovulating. 2) Stimulate her g-spot and clitoris simultaneously until she has a few orgasms. 3) Ejaculate as deep inside her vagina as your penis will allow. 4) Stimulate her g-spot and clitoris again until she orgasms. The orgasms dilate the cervix to allow the semen to flow into her uterus easier.