Siebe,
In one of the suttas, if I remember correctly, Rev Ananda explains to a female human being something along the lines of:
1) Although we should not get attached to nutriment (food), yet we can make use of nutriment to release us from sansara. (Nutriment provides us with the energy to maintain our bodies so that we can work towards Nibbana).
2) Although we should not get attached to desire, yet we can make use of desire to release us from sansara. (We can desire to attain Nibbana).
3) Although we should not get attached to pride, yet we can make use of pride to release us from sansara.
4) Yet although we are born of sexuality, we can never make use of sexuality to release us from sansara.
Living in the conditioned world, sustained by and relying on conditioned things, we have no choice but to use some of these very same conditioned things in our strivings to attain Nibbana. There is simply no other practical way to go about it.