Hi, Sair,
Oooops! I used the toothbursh/razor analogy in the wrong post … sorry about that.

There is no change in the idea I expressed, I just put it in the previous post. Now, let me address your concerns here…
Denying or simply devaluing the other purposes of sexual interaction in human relationships is simply side-stepping the truth. The use of sex for social bonding is not unique to humans, but it is very rare in the animal kingdom as a whole - a handful of other social species routinely engage in sex for non-reproductive purposes.
I think you jumped the gun on this one…

Everything we do, we not only do for a purpose but within a ranked order. Take eating as a basic example. Stop eating or reduce the caloric intake significantly and the person will die - the only difference being how soon in each case. Since the basic instinct in every organism to to continue in existence - and dying would be the antithesis of this value, then we eat to live. But, while this is the primary goal of eating - few of us human stop there…

There are multiple secondary and teritary goals - that are important but can not interfere with the primary goal (if they did, the person would die and end all goals). Sex is no different. The primary goal of sex is to continue - this time not as an individual, but as a species. Yes, there are other goals - but, if we lose track of the primary, things get quite confusing and simply disordered.
You will need to provide a reference (or two) on this non-reproductive sexual activity in non-humans. I am familiar of males and females roaming in the same herd, but the males are only interested in the females when the females come into heat and males begin the rut. This is strictly for procreation.
Rights correspond to interests.
Oooooooh, Sair, talk about a narrow and self-limiting definition!

Here let me help you with one that is truly broad (but, still has some serious limitations!) This is the link:
plato.stanford.edu/entries/rights-human/ But, you know, the one I like the best comes directly from the pen of Thomas Jefferson (here is the link:
archives.gov/exhibits/charters/declaration_transcript.html) and the part that really stands out:
“We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness…”
Now, ‘rights’ can be a tricky subject in the hands of some … for they tend to interpret ‘rights’ as license - and you can distinguish the two… because license is devoid of any real responsibility that shows respect for the person-hood of the other. While it is true one may ask, “May I debase you?” and the other says, “Yes, I want to be debased” - few would doubt that this is a total disorder of the human person whos is neither to debase or be debased.
Do you have more interest in expressing your natural proclivities than others have in denying you that opportunity? That depends upon the extent to which your natural proclivities interfere with the preferences of others.
You are really quite right about this part…

Take the demonstrated ‘natual proclivities’ of Ted Bundy (he was not ‘gay’). Many would say that he was rightfully denied his favorite method of expressing himself - and all of us are a lot safer since he was denied. Yes, this may seem like an far-fetched example … but, let us look again, how about Jeffrey Dahmer (he was ‘gay’) as someone who ‘proclivities’ became a danger to others. This is not to say that all proclivities are evil - but, unless you find a way to some type of ordered view of what it is we are going to be doing - we have people who quickly lose their way.
… it would be the same, in terms of actual impact, as denying you the opportunity to express your heterosexual inclinations.
Actually, Sair, it would be quite different. Extending your argument out to all heterosexuals - your view would be a death sentence for the entire human species. Prohibiting homsexual acts would not remove one person from the human family. And, that is a very big difference.
If it comes down to some original intention, then the human digestive tract was not built for the breakdown of simple sugars; the human eye was not built to be modified by artificial lenses; the human hand was not built to type on a keyboard.
This is not only another example of gratuitous assumptions - but of totally outrageous one! Here, let me help!

Simple sugars are carbohydrates that come from frutis and vegetables and milk, are quickly digested and give the body fast energy. They are not harmful. Vision is improved by refraction of light - the eye is not injured. And, our opposable thumb and dextrous fingers are a wonderful example of how wonderous God has made mad! Here is a link that may be of some help:
ehow.com/list_6371804_lists-simple-sugars.html
God bless