You can experience bodily harm from participating in homosexual acts.
For example, by participating in anal sex, one can experience anodyspareunia, diseases such as HIV, HPV, amoebiasis, chlamydia, cryptosporidiosis, E. coli infections, giardiasis, gonorrhea, hepatitis A, hepatitis B, hepatitis C, herpes simplex, Kaposi's sarcoma-associated herpesvirus (HHV-8), lymphogranuloma venereum, Mycoplasma hominis, Mycoplasma genitalium, pubic lice, salmonellosis, shigella; syphilis, tuberculosis, and Ureaplasma urealyticum, the chances of anal cancer, a relatively rare cancer, drastically increases, and physical damage to the rectum, and anus can manifest as generalized ano-rectal trauma, anal fissures, rectal prolapse, and exacerbating hemorrhoids.
Edit: Or, rather, the chances of contracting such diseases are increased.