Train up a child in the way he should go; and when he is old, he will not depart from it … a child left to himself bringeth his mother to shame...

And now that ONE plus ONE is ONE, let all that YOU do be done in LOVE. 
(1 Corinthians 16:14)

Men care and worry about size because they know that a small 'machine' has disadvantages, and impacts their performance; plus...

In sacred sex, the man sees his Woman as a gorgeous Goddess; and the woman sees her Man as a majestic Lord; as they blissfully 'worship' in the sacredness of the holy-temple.

Ideally, giving and receiving sexual pleasures should be between couples who deeply love and admire each other. That way, they ...