I've often wanted to write a homage to Diamond Geezer's wonderful Single Life posts, but his succinct descriptions of single vs. coupled life are far better than I could ever come up with.
But I've been thinking about this quite a lot recently, and here are some I'd like to share:
Single: You can have sex with whoever you want, whenever you want. Coupled: You have the best, most intimate, sex ever with one special person.
Single: You have the time to enjoy all the activities you want to do. Coupled: You enjoy all the activities you want to do with someone else.
Single: You are free to hang out with your friends. Coupled: You get to hang out with your best friend all the time.
Long-time readers might assume that the first on the list is the area closest to my heart (or other areas...), but actually it's the last; I miss my best mate.