We all fall into our habits, our routines, our ruts. They're used quite often, consciously or unconsciously, to avoid living, to avoid doing the messy part of having relationships with other people, of dealing with a person next to us. That's why we can all be in a room on our cell phones and not have to deal with one another.
The so-called sexual revolution is not, as advertised, a liberation of sexual behavior but rather its reversal. In former days, even under Victoria, sexual intercourse was the natural end and culmination of heterosexual relations. Now one begins with genital overtures instead of a handshake, then waits to see what will turn up (e. g. , might become friends later). Like dogs greeting each other nose to tail and tail to nose.