Here's how much sex happy couples have every month

The first two years of a relationship are usually considered to be the most exciting. After that, according to psychotherapist and author M. Gary Neuman, couples have to work to maintain that initial level of intimacy and excitement.

Neuman conducted a research experiment with 400 women who were either happily or unhappily married to find out how much sex happy couples should have every month.

Business Insider readers will get a 20 percent discount on Neuman's products for a limited time by using the promo code "businessinsider." Click here to visit his website.

--------------------------------------------------

Follow BI Video on Twitter: http://bit.ly/1oS68Zs
Follow BI Video On Facebook: http://on.fb.me/1bkB8qg
Read more: http://www.businessinsider.com/

--------------------------------------------------

Business Insider is the fastest growing business news site in the US. Our mission: to tell you all you need to know about the big world around you. The BI Video team focuses on technology, strategy and science with an emphasis on unique storytelling and data that appeals to the next generation of leaders – the digital generation.