I often hum very suggestive things
Why would you hum something like that?
I just find the things funny and entertaining.
If that is what makes you happy and nobody else is bothered, by all means!  You should feel free to hum whatever you want if nobody else is objecting.
I hum them because I love to annoy the people around me.
That makes it different, you should leave people alone and avoid annoying them so that you don't create uncomfortable situations.