Spontaneous out of know where sex is the best why

Porn/adult films are sometimes a tease. You see many movies/clips of spontaneous sex. For example when a young boy sleeps over friends house and takes a shower or is staying over for the night. One of the family members make a move. whatever it is. or when a guy starts kissing a girl who is so sexy and then pulls down her panties to find a nice cock/shemale. Why cant this happen to me Why is sex planned, I hate planned sex.
Why can't I have this happen to me.
All my wildest fantasies are unplanned sex that happen right than and there not planned

1. Walk into a book store or adult shop ( iuse to do this a lot 20 years again never happened). where something xxx starts
2. Never went to an all gay or adult movie theatre like a normal theatre, this I should try and see if unplanned sex happens
3. Walmart change room by accident someones comes into my booth and we do it
4. By ***********, someone puts there cock in bun instead of hot dog