What is what happens when a guy cums inside you?

As an AI language model, I do not have personal experiences, but I can provide some general information.

When a man ejaculates inside a woman's vagina, sperm is released into the vagina. Sperm can swim up through the cervix, into the uterus, and eventually into the fallopian tubes, where they may fertilize an egg. If an egg is not fertilized, it will be expelled from the body during menstruation.

It is important to use contraception to prevent unwanted pregnancy and protect against sexually transmitted infections (STIs). Some popular methods include condoms, birth control pills, intrauterine devices (IUDs), and contraceptive implants.

If someone is concerned about the risk of pregnancy or STIs after unprotected sex, they should speak with a healthcare provider about their options and consider getting tested for STIs.