To be fair, I think the Superman/Lex idea is bad myself but the whole gay angle is a result of bad description. I don't think Kon was ever supposed to be a literal offspring of Clark and Lex in the sense that Lena was the offspring of Lex and the Contessa. It was more a matter that Kon was more of a clone of one of them with genetic material spliced in from the other one.
Look at Damage who had the DNA of the JLA and JSA. You could describe him in a way that made it sound like he was the love child of a ton of heroes and Al Pratt. Nobody did that- possibly because of the number of donors involved- so we avoided the ick factor. Kon is nothing more than Grant Emerson reduced down to having one donor rather than a whole team.