What are "Slips"? I assume by "shorts" you mean boxer shorts, but "slips" I have no idea what it means.
I wear briefs, trunks or boxer-briefs (a slightly longer version of trunks). I gotta point out that ever since an ex-girlfriend introduced me to high-quality underwear 3yrs ago, (Calvin Klein, to be exact) I have never bought cheap underwear ever again. The top-quality materials, comfortable designe and perfect combination of support and "wiggle space" are worth every penny. I don't like boxers because there's no support, urine trickles all over when you walk after urinating, my balls (which are big and hang quite low) are all over the fucking place and it's just an all-around negative experience for me to wear boxers. And, I'll tell you that wearing supportive underwear has not hindered my gains one bit; to the contrary, the best plumpness I experience is when I wear briefs, believe it or not. The whole area stays lukewarm, which keeps better circulation on a flaccid state and therefore makes it plump like a sausage instead of shrink like a raisin.
Comment