I am asked those question because I know about "Sex Glue" - and how it effects the human brain / eyes while having sex.

(written from the males pov - but true for women too)

YOU NEED TO UNDERSTAND THE SIGNIFICANCE OF THE BRAIN TO YOUR SEXUALITY.

Changes occur in the males physical body during the sexual act that not only changes its physical appearance, but also affects it physiologically in many ways when a man is being sexual. FACT – to be a sexually successful man, you must have a sexually successful brain. Typically what a man thinks about and focuses on is what he ends up doing.

While all the case studies confirm that men spend a lot of time thinking about sex many times throughout the day, we must ask the question why so many men are not having sexual success. One reason is because of the manner in which men are thinking about sex. Another reason is the men’s brains have actually been trained about sex. This faulty thinking and training hinders the sexual success that men could experience. The good news is that there is an answer for these problems. It is possible to create a sexually successful brain.

WHAT IS SEX GLUE?

When a man ejaculates his brain receives its maximum chemical reward (more powerful than any illegal street drug). Critical to a man’s sexual success is understanding that whatever he looks at while having an ejaculation is what he will sexually connect or “glue” to.

Whatever his eyes focus on when he sexually releases - - - a person, image, object, will become etched in his brain as a photographic attachment toward that person, image or object. This called “SEX GLUE”.
So after a period of time of having sex with the same person, when he sees her, he is going to feel attached to her.

Hence the reason why lights should always be on during lovemaking and eyes wide open – make the eye contact to insure mental bonding of the two.

(This process is true for both men and women during sex)

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This thought process was confirmed by a man that always looked at his boots during his moment of ejaculation (with a female or during masturbation).... and after tens years he found that he could not achieve an orgasm with out having his boots on.