Again, they spent good money on this study?

Heterosexual men are more willing to assist women when they have visibly erect nipples, particularly when that assistance involves greater interaction with them, according to new research published in Evolutionary Behavioral Sciences. 

The authors of the new study had previously found that, for men, nipple erection serves as an indicator of sexual arousal. “So men perceive women with nipple erection as sexually aroused. How does this affect their behavior toward them?” wondered Rebecca L. Burch, a professor at the State University of New York at Oswego.

MORE