How to Do It At first, she thought she could ignore it. Photo illustration by Slate. Photo by Ridofranz/iStock/Getty Images Plus.  How to Do It is Slate’s sex advice column.  Have a question?  Send it to Stoya and Rich here.  It’s anonymous! Dear How to Do It, I just learned from my sister that my husband has been sending her messages for months. Specifically, dick pics. When I asked her how long it had been going on, she said the past three months. She thought she could just ignore it, but he’s worked himself up to as many as five times a day, and she is completely fed up. She showed me the photos, and it’s definitely my husband in them. How should I go about confronting him? —Married to a Pic Pervert Dear Married to a Pic Pervert, Your sister? Five times a day? This is so far over the line that it’s in a different time zone.…