Do that enough times, and you'll start to get horny when you see the object.
Personally, I find that repeated exposure to the same image/object results in loss of erotic stimulation. If what you're saying is true, there would only be about 100 or so porn flicks, and some combination of those would satisfy everyone forever.
A viewpoint held by a large number of people in society, is that homosexuality is not a good lifestyle choice.
People have lots of viewpoints. Should, say, Catholicism be suppressed because a large number of Protestants think it is not a good lifestyle choice? The fundamental values that inform our Declaration of Independence and our Constitution hold that we are entitled to self-determination, including the right to think, say, and be things that others might disapprove of. There has to be concrete, verifiable reasons to interfere with this entitlement. You have offered none. Instead, you reframe the issue as:
if someone's position is that homosexuality is not something society has vested interest in promoting,
This is where you are off-base. "Someone's" position doesn't matter except to that someone and his loved ones. "Society" doesn't require a vested interest in promoting anything to let people live their own lives as they see fit. "Society" must have a rational basis for restricting people's rights to live their own lives as they see fit. You are starting with the wrong default position, that there must be some good reason to allow liberty. This country was founded on the premise that there must be an iron-clad reason to restrict liberty.