In the movie Demolition Man physical intercourse and other forms of physical pleasure had been eliminated. "Ew! Fluid transfer? Not even kissing is condoned!" We are to assume that procreation was achieved through
in vitro fertilization or some other such lab technique.
Mathematically speaking, IVF is more successful at achieving pregnancy than does normal intercourse, and especially in woman 30-40 years of age. -
source
Statistically speaking the age of first-time mothers has gotten much closer to the 30-40 years range in the last decade than when compared to 30 years ago, with trends continuing to move toward that range. -
source
Therefore, based on these numbers and statistics, one can logically deduce that IVF is a better method of procreating than traditional intercourse.
Following from that, one can judge sex to be unnecessary.
But we still do it!
This leads to two conclusions:
A.) It is illogical to procreate through sex.
B.) Sex must have another purpose other than to entice one to procreate.
Therefore the statement "homosexuality is illogical" is false, as it fits under the description of "another purpose other than to entice one to procreate."
/thread