One of the characters is a rabbi who offers to circumcise the characters using a miniature guillotine, but it doesn't actually happen during the movie.
Broomhilda falls out the window and her horse doesn't catch her because she's bigger. She also falls on Little John and asks him flirtatiously is she can do anything for him and he says "yeah, you can get off of me"
There are a ton of overt sexual jokes, innuendos, sexual pressuring, flirting, mounting, making out, etc throughout the film. One of the main plot points is who will take Marian's virginity.
In the bathing scene, Marian is never fully nude, but there are shots where she's wearing nothing but a brief undergarment and the only thing covering her upper half is her long hair.
An old woman plans to get a man drunk so he'll sleep with her, but that doesn't happen. After that same man falls through her roof, she climbs onto him and touches him sexually, much to his horror. After another woman refuses to marry that man, he kidnaps her and tries to rape her.
There is a string of jokes about a man receiving unwanted advances from a woman he considers unattractive, including a scene where she holds him down on her bed and touches him sexually.
No one drowns, but after Robin defeats Little John, Little John falls into a very shallow stream and flounders around as he panics and screams that he's drowning.
There are no guns, but at the archery competition, an assassin's small crossbow is treated like a gun, as it's kept in a padded case and it clicks like a gun when it is loaded with a bolt.