Dr. Yu Wei Siang, know in Singapore as "Doctor Love," believes it's not always a medical condition that causes erectile dysfunction.

Yu, instead, chalks the problem up to boring marriages, according to a report in China Press.

About 80 percent of married men face erectile dysfunction five years into their marriage because they're forced to have sex with just one partner, the doctor said.

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Yu said 50 percent of men are faced with the boredom-induced dysfunction after being married for three to five years.

The paper quoted Yu as saying it is normal for married couples in general to experience low libidos following years of being with the same partner. He advised couples to spice things up by adding a new environment and stimulation to their sex routines.