The future? The chipping away by the elites will continue and fewer things will be called perverse. It’s already a toss up on which side of the divide polygamy lies. Sexual activities with children, especially infants, is likely to remain a perversion for the foreseeable future, but the age which a person is considered “consenting” will shrink. Like bestiality, necrophilia will come to seem less perverse, mostly because of the “no harm” argument, but considerable social stigmas will remain. Men pretending to be women and vice versa will gain in prominence and privilege; others will be required to play along (as it were).
Sexual activities in public, particularly man-on-man acts, will continue to be “celebrated”; see for example particular festivals in San Francisco, Rose Bowl (same-sex “wedding”) parades, Thanksgiving (Kinky Boots) parades, etc.). In one Enlightened country it is already now not illegal (saying “it’s legal” doesn’t capture the proper tone) to masturbate in public. The judge allowing this employed a “no harm” variant. Look for more open flies in your neighborhood; more nudity of every kind.
As above, it will seem increasingly socially but not sexually perverse to dispute these trends. To remain chaste or virgin is already an excuse for comedy and pity; these states will soon be badges of dishonor, they are already said to be “unhealthy.” People in the spotlight will be expected to name their objects of lust. The nascent movement in Christianity which identifies same-sex lust as a “gift” from God will gain strength (lust for children, animals, the dead and so on is not yet seen as a “gift”). It’s unclear how long until you’re expected to send visitors to your home out into the street so that passersby might have a go at them.