Here's the topic related to the economics of oral sex: the legalization of abortion in the 1970s reduced crime in the 1990s. The theoretical justification for this argument rests on two simple assumptions:
1) Legalized abortion leads to fewer "unwanted" babies being born.
Abortion reduces the number of unwanted children
2) Unwanted babies are more likely to suffer abuse and neglect and are therefore at an increased risk for criminal involvement later in life.
Unwanted children are at increased risk for criminal involvement, which is supported by three decades of academic research.
The effect of abortion legalization is large: as much as one-half of the remarkable decline in crime in the 1990s may be attributable to the legalization of abortion.