Sexual interest is obviously one of the primary human motivators. Blame it on biology, or God, or whatever. Wherever you put people together, especially young people in their prime, sexual curiosity will be in the air. This epidemic has been forever.
It doesn't matter whether they are gay, straight, or mixed-up. It happens when you put people together. People of strong character do not act on impulse when it is inappropriate, but many cannot resist the pull or just don't want to resist. It's fighting nature, and the addition of alcohol or other substances doesn't help. Neither does being away from home. People do get attached, form bonds, develop partnerships, loyalty, etc but raw desire has no respect for these civilized things. Furthermore, people need, at the very least, some form of "maintenance sex" for comfort but it is no insulation from reckless desires and romantic aspirations.
It seems to me that "sexual harassment" has come to include many expressions of virile or feminine sexual interest, extending the concept far beyond physical aggression (which is illegal. That is termed "assault," and can be felonious) to "unwelcome" advances.
In my life, I have been subject to hundreds of unwelcome advances from both men and women, and some of them were, well, forceful but not physically forceful. Weaker women might view much of it as harassment, but I took most of it in good humor because my brothers, my protectors, taught me about male tendencies. Women learn how to brush them off, but one of those advances turned out to be my husband of quite a few years and up to the present. A good guy, very shy and very smart, but who got up his courage to act like any other jerk because he felt he could not resist me. I could somehow tell that he was a good guy.
Now I read that the US Navy doesn't want guys looking at pictures of girls in the bathroom. What do they want these fellows to do for relief? Do they want an all-gay Navy? Or eunuchs?
From John Derbyshire, The Sexual Harassment Panic
The PC attitude seems to be to overstimulate children, but to de-sexualize adults. Or de-sexualize heterosexual adults, anyway. Does that make sense?