But that way they learn manipulating people instead of programming. The point of a programming assignment or exam is to force people understand programming. If you're hiring programmers you likely want "Masters Degree in IT" to mean "this person can code", not "this person can manipulate people".

Good for them, not necessarily good for other people and the company in general. And in my experience romantic or erotic relationships in a workplace is a very bad idea. It's probably this reason that a woman on a ship used to be associated with bad luck - in an all-male crew people are likely to fight for her favor, instead of cooperating. Note I'm not saying women shouldn't perform traditionally male jobs, I'm point out that an unhealthy proportion of men to women can encourage extra cheating.