That is an interesting question, but IMO it's important to realize that even fundamentalists of the US variety, and the RCC, and any Christian you care to mention, cherry pick just as much as the "liberal" Christians. They just do it on different stuff.
In other words, if you think that there is one and only one correct set of Christian values about sexuality, then you're being played by the fundies. They have successfully convinced you that their view is the right Christian one, and everyone else is just pretending.
Your question is interesting, but you're dangerously close to getting tricked into arguing for something you don't necessarily believe in.