Is Eric Cartman Bisexual?

I'm having a feeling that Cartman from South Park is bisexual. If you look at the episodes for example: Chef goes Nanners he gets kissed by Wendy, Make Love Not Warcraft he ask Clyde in french: Would you like to sleep with me? And on episode T.M.I. he measures the boys actual p*nis sizes. All these sexual innuendos of Cartman seems to show what his true sexuality is. What do you think?