It makes very much sense, You can chose to NOT accept it but then you should accept it when people may call you a homophobe and judge you. You should accept it that people would form opinions based on this and are free to do so. Would you not called someone Racist if he she says that seeing black people makes him sick? So be ready to be on the other side.
The whole idea about it is that a thing that has been scientifically proven to be natural cannot be left to the discretion of the individual tastes
Bodies designed for opposite sex? Who said so? Isisnt that teh whole reasarch about? That it is natural. If you consider intimacy and sex as only means of bearing children, what about people who cannot concieve? or women past menopause ? Their bodies are no longer fit to bear children, whould we be disgusted by the thought of them having sex?
There are still areas in the country where women stay outside their homes during their periods because the "Men folk" are basically disgusted by the idea of blood, the powerful majority dictates how the world works and what rights they have. Similarly the powerful majority here "Straight" men/women are trying to justify it based on what they like and do not like.
This is discrimination of the purest form, why defend it? If you are ready to accept this discrimination, you should be ready to accept many more discrimination that have existed in our society..the practice of un touchables foe eg. Why do we criticise people who still promotr this practice?
You may chose to beleive whatever, but don't be offended if you are judged based on that.
And again about incest etc: As i suggested, please read the research on Homosexuality , all these questions have been answered many many many times. Atleast understand Why homosexuality is natural , how they finally arrived at this conclusion.
Till then food for thought:
Traditionally right hand was used to eat and left to wash yourself. Left hand was considered dirty and disgusting. Imagine watching someone in front of you eating with the same hand that reminds you of washing ...disgusting ? Based on this, am I justified to call left handed people disgusting, vbecause Right handed individuals are the natural ones as per me? And I should not be criticized