This question is generic in regard to size(s)?

I was watching late night television the other day and came across one of those infomercials for male enhancement. I know that these are really just huge marketing schemes to sell a product but it brought a question to mind. That is regarding size and does it truly matter for those non-shallow individuals. Size in regard to the afore mentioned infomercial was but could also be turned around to be size as well. Also If size becomes a issue later because of child birth changing the sizes wouldn't that mean those that say size is important all leave spouse? Just as side note always thought this joke was funny but think about this "a semi truck looks small compared to the grand canyon" so if women says someone is small maybe its similar to that joke. If size is so important then all smaller men and flat chested women would never marry. Or am I way off base? Just something to really discuss not that agree size is important (i am average and wife is smaller in chest ares) but really like some feedback on this topic. That ad just made me think how shallow someone would have to be in order to buy those products to impress someone or for someone to judge on the criteria of size.