A member asked:

Just tell me more about sperm swimming. can sperm really swim from stomach to the vagina & cause pregnancy? if sperm is on hands and i touch my vagina from outside, can it cover such a long distance? i am not pregnant, just need information. thanks?

A doctor has provided 1 answer
Dr. Jay Park answered

See below: Basic science: Semen, ejaculated during male sexual act, is composed of sperm and fluids from seminal vesicle and prostate gland. Alkaline characteristic of prostate fluid is quite important for successful fertilization. Sperm's motility becomes optimal when pH of surrounding fluid rises to 6.0 to 6.5. Vaginal secretions in female are acidic, pH 3.5-4.0. Ejaculate should be inside vaginal canal

Answered 10/19/2020

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