How to Do It I’m so sick of this. Photo illustration by Slate. Photo by 78image/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’ve struggled with my penis size since adolescence, and I’m now entering my late 20s. This isn’t body dysmorphia; I’m barely above the threshold for a micropenis. I’ve had a handful of sexual encounters, none of which were particularly positive, and I’ve never been able to trust someone enough to even try to pursue a relationship. I’ve also had many experiences hearing female friends disparage their former male partners’ penis size, and most of my sexual experiences have included some expression of disappointment when my underwear comes off. I really do want a relationship, but I’ve become deeply pessimistic about it.…