Story from my past NSFW:
When I was growing up, experimenting in the bath, I thought it would be handy if they made sex robots that could switch from female to male, so I could not only have sex with my female robot, but also secretly find out what it would be like to replace the intense feelings that my finger gave me in my butt whilst jerking off, with a dick-shaped object.
So I was definitely daydreaming of android dick.
Of course no such robot existed, but then I followed what was for me at the time a very surprising chain of logic. I realised that men have dicks and that a man could put his dick in my butt, and that I would like that to happen, and since having sex with men is gay, I must therefore be gay (as well as straight - I had never heard the word bisexual). This blew my mind quite a bit, I can tell you.
I wanna put my dick behind yours and squash them together so our dickheads are rubbing against each other and thrust against each other until we both cum.