10. Wrongly put. Raj and Howard are not at all gay; they just face people expecting they are, especially given Raj’s inability to socialize with women and his interests in certain things more associated with women.
10 is not wrongly put….that’s why they call it a running gag - it’s a theme of the show, even though it is not literally true.
I would add that Leonard is hopelessly out of his league with Penny, and such a relationship would never happen.
They converse like old married people at times, even now that Howard is married.