For all its titillation, sex is not the central obstacle affecting the central characters in this film. The problem they have is not a physical one but a communicative one. For the majority of the film, nobody says what they are thinking or feeling. They instead say what they think the other person wants to hear. That is no way to build a true loving relationship.
Communication is a vital part of any relationship.
There is no sharing. The sign of a mature relationship is not one that is marked by a physical consummation. Rather, it is the one that is marked by a commitment and full sharing communication between the partners. Animals can have sex. There is nothing unique or special in two creatures merely engaging in a physical union.