Version 1, Version 2

Version 1, Sky News:

Lap dancers who are at the peak of their fertility earn more in tips than their colleagues, a new study has shown. The study provides more evidence that women send out "secret signals" to men at times when they are ready to conceive.

Experts suspect that pheromones - subtle scent signals that in animals play a key role in sexual attractiveness - may be involved. In other words, fertile women smell more appealing to men.

The evidence was the first to show that oestrus has a "real effect on women's earnings," Dr. Geoffrey Miller told New Scientist magazine.

Oestrus and Its Affect on Women's Income

Version 2, Liz Smith:

If you think things are crazy, consider this. The University of New Mexico recently did research on lap dancers and their menstrual cycles.

Man, Them Scientists Are Just Nuts These Days