There was a time before spandex, where shorts were baggier, but often suggestively sexy by hinting at something magic inside them…
When I was a kid, and I masturbated around 7 times a day*, one masturbation fuel was those tight shorts… About like basketball shorts back when they were tight, before they became unsightingly baggy.

And you, what were your fondest memories of times before spandex?
Those shorts were in a rather thick fabric, but they framed the bulge wonderfully well, and best is that no one was ashamed to wear them like yankees would be (whenever we went to the US for vacation, we found it funny that they would always have baggy bathing suits).
Alas, that example is black, but believe me that despite not being spandex, it honestly did a very good job of showing-off the package and memories of boys wearing them at school are still potent (especially that super hot, tiny vietnamese guy who had such shorts, but blue, to whose memory I masturbated very often)…
* Waking up. Morning shower. Lunch time (school was close enough for me to walk home for lunch). Back from school. Early evening. Evening shower. When going to bed.