What's the difference between my niece and my military commander? My commander doesn't cry if I accidentally discharge. Get it?
I think ejaculating on a child sounds disgusting. Are you making fun of molesting children?
Who? My niece? No I never. Don't accuse me with things I didn't do! You can't say a 17-year old can't be sexually exploited.
While it's okay to make jokes, it isn't okay when those jokes are about childhood sexual assault since it trivializes the pain and suffering the victims of those assaults experience. People who have experienced childhood sexual assault need a lot of psychological support to overcome what happened and trivializing that experience disinclines people to get the help they need. Instead of joking about a subject many consider to be disgusting and offensive, why not joke about lighter things?
So I can't make a joke then, right?
There are plenty of things to joke about. You need to find something that is actually funny to get people to laugh.