This is nonsense - my late father and mother slept apart for 40yrs (understandable - look what resulted when they slept together ) - but they absolutely loved each other in their own way.
Further, you're all looking at it from a male point of view - it's a generalisation of course but one that holds fairly true that women do not see sex as the be all and end all of a relationship in the way that most men do.
Lastly, the vast majority here are looking at it from the point of view of males who are willing to travel thousands of miles to pay for NSA sex with (as Frequent would say, "sex partners young enough to be their grandchildren"). I'm not criticising that as a lifestyle choice (I've done more than my share) but I would suggest you're hardly representative of mainstream opinion and it's not the ideal standpoint from which to comment on what makes a loving relationship.