Bacterial

• Chancroid (Haemophilus ducreyi)
• Donovanosis (Granuloma inguinale or Calymmatobacterium granulomatis)
• Gonorrhea (Neisseria gonorrhoeae)
• Lymphogranuloma venereum (LGV) (Chlamydia trachomatis serotypes L₁, L₂, L₃. See Chlamydia)
• Non-gonococcal urethritis (NGU) (Ureaplasma urealyticum or Mycoplasma hominis)
• Staphylococcus aureus, MRSA - Sexually transmissible.^[6]
• Syphilis (Treponema pallidum)

[edit] Fungal

• Jock Itch - Sexually transmissible.
• Yeast Infection

[edit] Viral

• Cytomegalovirus (CMV) through skin to skin contact, saliva, not only sexually.

• Hepatitis B.
  (Note: Hepatitis A and Hepatitis E are transmitted via the fæcal-oral route, not sexually; Hepatitis C is rarely sexually transmittable,^[7]and the route of transmission of Hepatitis D is uncertain, but may include sexual transmission.^{[8] [9] [10]})

• Herpes simplex
  • Herpes simplex virus implicated in Alzheimer's disease.^[11]
• Human Immunodeficiency Virus (HIV/AIDS)
• Human papillomavirus (HPV)
  • Certain strains of HPV cause genital warts
  • Certain strains of HPV cause cervical dysplasias which can lead to cervical cancer, penis cancer, anal cancer, oral cancer, head and neck cancer.
• Molluscum (MC)
• Mononucleosis is spread through saliva, can occur during sex.
• Kaposi's sarcoma-associated herpesvirus (KSHV/HHV8)
  • The cause of Kaposi's sarcoma

[edit] Parasites

• Pubic lice, colloquially known as "crabs" (Phthirius pubis)
• Scabies (Sarcoptes scabiei)

[edit] Protozoal

• Trichomoniasis (Trichomonas vaginalis)

[edit] Sexually transmitted enteric Infections

Various bacterial (Shigella, Campylobacter, or Salmonella), viral (Hepatitis A), or parasitic (Giardia or amoeba) pathogens are transmitted by sexual practices that promote anal-oral contamination. Sharing sex toys without washing or multiple partnered barebacking can promote anal-anal contamination. Although the bacterial pathogens may coexist with or cause proctitis, they usually produce symptoms (diarrhea, fever, bloating, nausea, and abdominal pain) suggesting disease more proximal in the GI tract.

[edit] Sexually transmissible oral infections

Common colds, influenza, Staphylococcus aureus, E. coli, Oral Herpes and the yeast Candida albicans can all be transmitted through the oral route.