I think its fine. We are so bombarded with it from the media, we just mindlessly repeat it almost, but i think it takes on a more endearing meaning then. One time, a few years ago, when the birth control patch was more popular, a coworker hurt her back and asked me to help her apply one of those icy-hot pain patches. So i did, and as i finished patting it in place i said, "you can go have sex now!" Because all of a sudden it just looked like a huge birth control patch, and the comment was out of my mouth before i could stop it! We were both shocked, then we both started laughing i hope it works out for you and your friend too.