H.I.F: Interesting
Corroborative evidence about the innate goodness of natural family planning:
"Men who find themselves in the company of fertile women are more likely to make creative attempts at sentence structure to signify their mating fitness, a study has found. Researchers discovered that when young men talk with a woman who is in the fertile period of her menstrual cycle, they react to small changes in her facial skin tone, vocal pitch and scent. The changes activate their mating goals and cause them to shift the way they speak." Link.
