For Valentine's Day, men should get trading advice

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Traders work on the floor of the New York Stock Exchange

The best Valentine's Day gift this year might be investment advice—given by women.

That's because year in and year out, women continue to beat men when it comes to investing. The biggest difference is simply that men trade more, paying more in fees. All that portfolio churn hurts the overall return of their portfolios.

The data comes from SigFig, an online-based investment advisor who reviewed over 50,000 accounts for CNBC.

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CNBC last wrote about this concept at the end of 2015, showing that women consistently beat women for this reason. But 2016 was a new year, and in came a massive decline in the stock market. So did anything between the genders change?

Apparently, the answer is no.

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Women have been beating men again in 2016. Entering last week, SigFig said the median woman performance is -7.2 percent, a decent improvement over the median male of -7.6 percent.

Just as before, the problem for men has been trading too much. Men have traded about 30 percent more than women in 2016. That continues a trend of men having about 1.5 times more portfolio turnover than women.

Last August, the markets dropped a lot, yet investors who didn't panic were rewarded as a recovery restored those losses late in the year. This was another reason why women beat men in 2015.

So far this year, it's not clear that the average man has learned from that approach.