... include:

1) HIV/AIDS
2) Anal Cancer
3) Chlamydia trachomatis
4) Cryptosporidium
5) Giardia lamblia
6) Herpes simplex virus
7) Human papilloma virus
8) Isospora belli
9) Microsporidia
10) Gonorrhea
11) Viral hepatitis types B & C
12) Syphilis
13) Hepatitis A
14) Giardia lamblia
15) Entamoeba histolytica
16) Epstein-Barr virus
17) Neisseria meningitides
18) Shigellosis
19) Salmonellosis
20) Pediculosis
21) Scabies
22) Campylobacter
23) Genital warts
24) Perforated colon
25) Anal sphincter incompetence accompanied by chronic leakage of fecal matter
26) Hemorrhoids
27) Anal fissures
28) Anorectal trauma
29) Mental health problems
30) Shortened life expectancy

[if you disagree, consult CDC statistics]

... and, what's even worse ...

31) Limp-wristedness
32) Lisping

Common side effects of female homosexuality:

1) Broken-hearted males whose ego is shattered after thinking they could screw their (maiden)heads on "straight".