Men's Fitness and Shape teamed up to get to the bottom of how men and women truly behave in the bedroom. The results of the poll of over 11,000 men and women appear in the December/January issue of Men's Fitness. A look at some of the surprising results:

• The No. 1 reason guys say no to sex is work-related stress; women blame body-image problems.

• 64 percent of respondents (men and women) say they're engaging in sex three times a week or more.

• 82 percent of men consider themselves either good or excellent lovers, but 43 percent of women said only "a small percentage" of men stand out in their minds as great lovers.