We tried the exchange and then we can add our own opinion on the matter. Of course the answer would require a lot of space but we try to condense into a few lines . We believe that first before taking into consideration the idea , you need to talk in depth with your partner and try until you are absolutely certain that it is a shared desire and not a force of one on the other. It is absolutely true that men begin to mate on this ground , we met couples where the opposite happened and others in which the wish was compartito to 50%. The important thing is that a conscious choice on the part of both, aimed to add something extra in the sexual relationship and not a piece to a relationship in crisis. In fact, the exchange works if the couple and close-knit and sexually exuberant, eager to add a little ‘ spice to a relationship already in itself quite driven and full of eros . Not recommended for people of habit , having sex traditional , discounted and deeply rooted prejudices of a religious nature .