You really can't get STDs from toilet seats

No STD from toilet seat

Sexually Transmitted Diseases (STD) are transmitted mainly, as the name implies, during sexual intercourse - Oral, Vaginal or Anal.

Although it is possible to get an STD when transfused with infected blood, or indirectly when infected materials come in contact with a break or wound on the body, getting infected from a toilet seat is an idea that sounds possible, but highly unlikely to happen.