This guy on Quora has some interesting anecdotal evidence : r/humblebrag
Does a girl know when you have an erection when they sit on your lap? - Quora
Are boners easier to see in jeans? - Quora
A Guy with a 12-Inch Penis Did a Reddit AMA
Why Are Men at the Gym Wearing Dick Towels? Jezebel Investigates
Do women enjoy seeing a man with an erection? - Quora
Do girls like when guys send pictures of their pants? - Quora
Do girls like when guys send pictures of their pants? - Quora
Do girls like guys with erection in their pants? - Quora
Are Speedos for Men Ever Okay to Wear? - How to Wear a Banana Hammock
I Am a Woman and I Took Viagra: Benefits and Side Effects
Do girls like guys with erection in their pants? - Quora