What are the chances of Precum having sperm in it?
The short answer is: It can. Even though pre-ejaculatory fluid itself doesn't contain sperm, there is the possibility it comes into contact with sperm. Research shows that living sperm can leak into pre-ejaculatory fluid in men. One study found the presence of sperm in the pre-ejaculatory fluid of 16.7% of healthy men.
Can Precum on the surface cause pregnancy?
If the penis isn't inserted into the vagina, and only the tip of the penis (with precum) comes into contact with the outside of your the vulva, it's extremely unlikely that precum on the outside of the vagina will lead to pregnancy. However, it is still theoretically possible for pregnancy to occur.
How long can sperm survive on skin?
between 15 and 30 minutesOn skin or other surfaces, sperm can live between 15 and 30 minutes. In hot tubs or bath water, this lifespan decreases to a few seconds or minutes.