I should point out that my comparison to changes in sexual habits alludes to the change in personal mindset involved more than the actual acts themselves.
The comparison with HIV/Aids awareness is that prior to those campaigns it wasn't really commonplace to think of the safety of sex first and foremost, and although condoms were obviously used as a means to prevent pregnancy, they weren't really associated primarily with being a barrier to prevent transmission of STD's.
Certainly I recall vividly the change in attitude and outlook the campaigns prompted in me and my peer group. Everyone started questioning the risks associated with casual sex in a manner that they did not previously, most started carrying condoms as a matter of routine etc.
The jist of the comparison is that things that were previously inconceivable quickly become the norm, people adjust, and forget that things that are then taken for granted were once completely different.
I'm not suggesting children not be permitted to have touch contact with each other, or that people should continue to be prevented from meeting their parents, both of those are measures attributable to lockdown scenario. The 'social distancing' I'm referring to is more about unnecessary added risk on top of that already posed by simply interacting with relatives and loved ones. I think it could well become the norm to have things like shopping trolleys disinfected as a matter of course, set capacities for shops with regards to how many customers they can accommodate at any point, etc etc. Once these things have been around for a while, nobody will even notice anything out of the ordinary, hence the comparison with condom usage etc.