Reckless behavior happens between homosexual men, because men's sex drives are driven by self-gratification and there is no limiting perspective among the partners.  Indeed, so-called open relationships between homosexual men are common, to the extent that any homosexual men form lifelong partnerships.

Calling their reckless, misuse of their sex organs is just calling attention to biological fact: combining one's sexual anatomy with other systems' anatomies with no physiological purpose but pleasure with the exposure to deadly disease is not the normal order of human conduct.