(Not for the faint of heart.)

1. 42 is the answer to life, the Universe, and everything. We use it to represent everything that exists. Rule 34 states that there is porn of everything that exists.
2. Reverse it into 24. Logically, the porn of life, the Universe, and everything must exist parallel to life, the Universe, and everything.
3. As humans, our sight is limited. Only God can truly see everything (including what lies beyond the Universe, such as porn of it), so we throw Him into the equation. Add 10 to 24; 10 represents God because it is the square of the Holy Trinity (3^2=9) plus God's one-ness (1). This is derived from Dante's The Inferno.
4. The resultant number is 34.

(Disclaimer: God does not condone masturbation, although He admits killing kitties is kinda fun)