>>81548243>It's not like height because it can't be a first impressionThat makes it worse though. If you're short, many women will reject you on first sight, but at least you know that the girls who do give you a chance are okay with it.
If you have a small penis, no girl will know. And more importantly, no girl will assume that you have a small one. If she's attracted to you she won't even assume you are average. She will instinctively assume that you are big. So after you put in the time and effort into getting her to have sex with you, if she's disappointed - and she will be if you are actually small - that can kill the relationship. It might not even happen instantly, she could stay with you for months or years slowly letting the regret and the resentment build up before she finally ends it. Or maybe she won't, and she'll cheat on you behind your back instead and THEN break up with you when you find out.