I just added this to my Netflix queue, since I hadn't seen it since 1989, when it played in theatres. It's the story of explorers Burton and Speke traveling through Africa in the 19th century looking for the source of the Nile. I am not sure how much of the rest is accurate, but it is implied and even shown, a bit, that the two were attracted to each other...or at least Speke might have been attracted to Burton. I recall one of them kissing the other on the mouth when one was very ill and might have died. I don't remember any boos or hisses from the audience, though, which is nice.