Can i sex with multiple persons and after that what diseases do i get to have sex?

You can get many diseases with unprotected sex, and unlikely any with safe sex. Pregnancy is a main concern but HIV, HERPES- 1&2, HPV, GONORRHEA and SYPHILIS. There are more, so at your age you should learn about safe sex and choose partners wisely.

You get the most from this site when you provide detailed information about your problem followed by a question. In the post you are listed as a 21 y/o female, but nothing else. There is no information to describe you as a normal person on a bedridden one. There are at least half a dozen sexually transmitted diseases and an equal number that can be passed that way. You can start over.

You are at risk of getting pregnant and getting sexually transmitted diseases. For latter, visit this site for info: https://www.cdc.gov/std/default.htm Get HPV vaccine. Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines Wish you good health!