Thanks you all for your answers.
In what concerns what I put in bold, I don’t know if I agree with that. You say that each sex act must be ordered towards procreation. Then, I am asking myself, why do we use our infertile days if our purpose must be to procreate?
Please do not send me all of you towards the Cathechism, I have indeed read it but it;s because some things are not so clear to me that I came here with my answers.
I mean, our purpose is not to procreate, this is what we want when we use these periods, so inside us we should still be open to make a baby, is that what you wanted to say?