Overall, I like them, except for #3.
#5 is my favourite, with #2 a close runner up.
At length, and save for #3, you were consistent in your exposure. Yes, the subjects are oft in shadow, the contrast is high, and the shadows are deep. That's what makes them –both subjects and photographs– stand out. Whether you were aiming for this or forgot your fill light/reflector only you know, but it turned out for the best: why would you like images that look just like every other photographer's anyway?
Exposing your subjects like they are almost silhouettes allowed you to give a certain mystique to the images: almost like peeking into the couple's relationship whilst remaining respectful of their intimacy: a dichotomy that's not at all easy to achieve! It also enabled you to insert subtle artistic elements, llike the heart shape formed by the lovers' bodies in #2. Had you exposed them 'properly' and fill the shadows, you woulda destroyed the magic.