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There are several hundred such sexual responses categorized by therapists. The most common is probably bondage, and shoe fetishes are high on the list, but diapers is right up there with them. Since these responses do not cause harm, like pedophilia does, they are not talked about much, except by therapists and police officers who sometimes encounter related prostitution activities. The best theory is that sexual response preference develops from subconscious reaction to social experiences at age 7 or so, when the human sex drive turns back on after going dormant prior to age 12 months. If this theory is correct, you will not likely outgrow this response until you are very old (barring a miracle of course). We have discussed related matters in these threads, and the best opinion is that as long as there is no harm, and love is expressed, sex between husband and wife may take any form, even engaging in such roleplay.