Homosexuality was classified as deviant and listed in mental disorders in the DSM within the last 30 years? So it is only a matter of time for the other deviant sexual behaviors to change.
The only reason it was changed because of wealthy homosexuals lobbying the psychiatric association to change it. NAMBLA is trying to change laws all over the place to change the age of sexual consent with children. Just because homosexuality has been made palatable in our generation does not mean that it is not a deviant behavior. Even if it is genetic like, oh say alcoholism, a person can struggle with it but can change. It is a behavior defining a group of people.
If women would stop giving the milk away without the purchase of the cow more men may decide to remain faithfully married and might get married. Not that it isn't a woman's fault that a man cheats but women don't necessarily help the situation in the sex saturated society.
So why would you think these other behaviors are deviant if there is "no one" hurt physically? It is just sex and there is love between the people (2 or more, men women and possibly children)? When you change the definition it must apply to these others too because you have no grounds for not applying it.
And China quit allowing singles to adopt because homosexual couples lied and the agencies didn't police it. Oh yes they lied. There was a statement of heterosexuality that had to be signed and notarized to adopt. I know I signed it. China said if the agencies won't police themselves we will. So single adoptive parents are no longer allowed to adopt, even celibate singles.
Oh and I will remind everyone again that the blood donation questionnaire forever bans men who have had sex with men along with drug users and those who have shared needles. Tattoos have a 6 month to a year ban and certain countries have a year ban. But forever? The medical community must know something.