Adkinje,
I used to take Benadryl and Dramamine (Both had the same effect and classified as a delieriant) recreationally. However, I never had any heightened sexual arousal. It is definately a good idea for you to discontinue use. One reason is simply the psychological effect it has on the brain. The reason it is classified as a delieriant and not as a hallucinogen is because unlike LSD and Mushrooms, it can actually make you see and interact with things that are not actually there, or even make you not see things that are there (i.e. I once did not see a chair that was in the middle of my path and toppled over it). Long term side effects are not well known yet, because recreational use of this drug is a fairly new thing. But they may include a risk of permanent dementia, and brain and stomach damage. You know that fuzzy electric feeling you get in your head when you take it? I always felt when I was on it that it was some sort of brain decay. It also can cause a great deal of stress on the heart at higher doses.
If you want to heighten your sexual experience, I suggest looking into some sort of sexual exercise or kama sutra of some sort. Much safer than a mind altering drug.