Can a kiss on lips cause pregnancy?

Answer 1

No. Pregnancy occurs by semen traveling up the vagina, through the cervix, into the uterus, and to the fallopian tubes, where it meets the female ovum (egg). This is the natural way that fertilization occurs. After this meeting, the ovum must implant into the endometrium (lining) of the uterus where it will divide (as an embryo) and then grow(as a fetus), over a 9 month period, and (hopefully) be delivered as a healthy infant.