The Husband <-> ExBoyfriend flip is interesting with the point brought up. Kind of funny to think that your "kids" wouldn't really be a continuation of "you" so to speak, rather some other guy's genes who's body you now occupy. Sure your going to raise them and all, but aside from the obvious surface level traits, genes do color some personality aspects. Could it be considered to be cucking yourself?
Seems like the Weatherman <-> Female Zookeeper switch is most mutually beneficial arrangement assuming they don't care too much about being the opposite gender. They kept their respective jobs intact, but are better at them with their new bodies, and they kept their friends around.