In one answer, yes!  If there were no difference in sexual characteristics between men and women, then the attraction would fade on a worldwide scale.  Okay, so some people are gay and/or lesbian but that does not change the difference in sexual characteristics.  Sexual difference is what makes the genders separate and want to attract one another.  Try to think less about a man and a woman as a person and more like plus minus in sexual charge.  A woman does not necessarily have a certain charge as does a man.  This means that just because a man likes certain sexual stimuli makes him a man.  For example, a woman who enjoys the smell of roses does not make her more of a woman than the woman that loves to smell gasoline. They are both women, but neither has a preset sexual characteristic list.  The gender of a person has no bearing on the sexual characteristics of that person.  Although, the gender of a person does indicate what sex the partner should be.  Again, a man should want to explore all sexual characteristics with a woman, not same gender.

In order to address the same sex relationships, gender should be focused on more.  Unlike the sexual characteristics, gender is very clear.  As weird as it may seem to others, same sex relationships are just a lack of options to address an individuals’ sexual character.  For example, a man who wants to have a partner who loves reading novels and quiet libraries has to find a woman who loves these things.  The character is merely a blueprint for attraction, but gender must be opposite.  The characteristic is not the determinate because a woman can love the same things a man does.  Gender does not have a bearing on the sexual characteristics of the person.  The characteristics are just a preference, but the decision to make gender the issue is merely a choice.  For example, just because a woman wants a masculine partner and chooses that person to be another woman is a choice.  This choice has nothing to do with the sexual characteristics of the woman.  In many cases, same sex relationships arise from lack of sexual outlets from opposite sex partners.

In any case, blaming sexual characteristics on gender is a lie.  No man/woman should have to be with anyone who does not fulfill their sexual characteristics, as long as the gender is opposite.