Bulges are bulges if there erect otherwise it's not a bulge lol. Anyway some guys are growers like me and it depends on the material. Soft material shows shape but jeans dont really. Your right sometimes I have a 'bulge' and I can't be bothered to hide it so I am aware most of the time unless im around girks then I hide it
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Testicle size also affects a potential bulge.
So I take it you only date guys with visible bulges?