Can sperm go through a single underwear to cause pregnancy? what are the chances of this happening? a lot of contradicting answers on the site.thanks

Extremely unlikely: It is unlikely that sperm can swim through a fabric to enter the vagina, if the semen was deposited on the outside of the underwear. A certain dose of sperm needs to be deposited in the vagina for pregnancy to occur under normal circumstances. Under the most favorable circumstances of semen in the vagina in an ovulating fertile woman the likelihood of pregnancy is 1 in 3. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine.