Is this why self pleasure is a sin?

In this video Dan hits back on the myth that in the bible / god will any sex outside of marriage is a sin.   He shows how many different sexual acts and groupings were included as Ok for the morality of the time.  I am listening to Separation of church and hate by John Fugelsang.  In the book he explains that the bible is a collection of writings written for the people of that time, the culture of that time, and about the morality accepted at that time.  He shares examples where different authors flat out disagree with each other, but they were separated by ceneriesin time.  Dan mentions something like that here and how each author had their own view of sex and what was moral.  He explains sexual agency and how in the bible for it to be considered sex a penis needed to be involved going into an orifice of some person with lesser status than the man with the active penis.   I like at the end where he talks of the dangers and torments of telling  developing children going through puberty that simply touching themselves is a sin, makes them an abomination to god, and will condemn them to hell.  Hugs