There is no reason to think so. The two men were intimate friends who went through many difficult tests together. In our time (at least in the USA) we have difficulty imagining emotional intimacy that is not accompanied by sexual intimacy. read more
If you find it funny that famed western explorer Meriwether Lewis might actually have desired William Clark, the joke was probably hilarious. But if you don't think it's absurd for one (historically important) man to desire another, it's just a very tired anti-gay joke. read more