While mondays are widely considered to be the worst clubdays, there should be enough to do in either Sharks or Oase. Sharks has a far smaller garden, but plenty of places to have sex. Oase has huge garden now, but it is maybe a bit less geared to sex... they do have a "room" in the open air with a view of the whole garden. That's definitely worth trying... I actually once had sex in the Oase garden in februari (waiting times for rooms), fricking cold... but also kind of fun being huddled under a robe beneath the night sky (and of course being the only ones outside).