Provided it does not lead to any diseases that can be transmitted to nonconsenting persons, and whose treatment has to be be financed by taxpayers.
Treatment of diseases by taxpayers (socialized medicine) is inherently wrong in itself, and should not be used as an excuse to commit another wrong (government control of the private sex lives of consenting adults).
And intentional transmission of disease (or transmission of disease by silent but knowing sexuality) should be criminally accountable (whether homosexuals or heterosexuals are the perpetrators).