Can a person catch diesese by messing around with two different people even if neither have anything-?

It is possible for a person to catch a sexually transmitted infection (STI) or disease by having unprotected sex with two different people, even if neither person has any symptoms or knows that they are infected. This is because some STIs, such as chlamydia, gonorrhea, and HIV, can be transmitted without any visible symptoms or signs of infection. It is important to practice safe sex and use protection, such as condoms, to reduce the risk of catching or spreading an STI or disease.