You are tired. You are looking forward to a good night's sleep without interruptions from the kids. You undress for bed and put on your night clothes. Unbeknownst to you, your husband has caught a glimpse of your figure in the mirror as you were undressing. No, just created by God to be visually stimulated by the sight of you.
Imagination also plays a very powerful role for men in sexual excitement.
Another study said men dream about sex three times more often than women. There is no doubt that part of this male preoccupation with sex is due to the pornographic society in which we live. I'm certainly not condoning lust created by advertisements, radio, TV, and movies. But another part of this fixation is just God given. Our brains are wired for dreaming and imagination.