What are diseases that spread through sexual contact called?

Diseases that spread through sexual contact are referred to as sexually transmitted diseases (STDs). This term encompasses a variety of infections that are primarily transmitted from one person to another through sexual activity. These diseases can be caused by various pathogens, including bacteria, viruses, and parasites, but the collective term "sexually transmitted diseases" specifically highlights their mode of transmission.

In contrast, contagious diseases typically spread through general contact or respiratory droplets and are not solely limited to sexual transmission. While viral infections and bacterial infections are types of pathogens that may cause some STDs, they do not exclusively define the diseases associated with sexual contact, as they can also include non-sexual modes of transmission. The term sexually transmitted diseases accurately captures the focus on transmission through sexual activity, making it the most appropriate choice.