On this whole subject in general and the liberty of expression in particular, I will cite Karl Popper: "“Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them… We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant. We should claim that any movement preaching intolerance places itself outside the law, and we should consider incitement to intolerance and persecution as criminal, in the same way as we should consider incitement to murder, or to kidnapping, or to the revival of the slave trade, as criminal.”
If something exists without taking anything from you, I don't see why you would want to take that away from someone else. Be it sexual orientation or anything else. Your freedom is only limited by the freedom of all others.