How can I test if my son is gay?

I am worried my son might be gay. I want to get him checked. Isn't it possible to get a hormone check? A vocal chord check? Can't a doctor indicate whether he is gay or not? My son has almost no muscles and narrow shoulders. He also has blue eyes. He talks in a very high voice and while he sings he sounds... show more I am worried my son might be gay. I want to get him checked. Isn't it possible to get a hormone check? A vocal chord check? Can't a doctor indicate whether he is gay or not? My son has almost no muscles and narrow shoulders. He also has blue eyes. He talks in a very high voice and while he sings he sounds like a castrato. He tells me his voice is called tenor.
How can I test if my son is gay?
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