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Andrew,
The Church teaches that a man and woman can licitly marry if one or both is infertile. However, they cannot marry if one or both is impotent, i.e. unable to perform the marital act.
This is because the consummation of a marriage is in the two becoming one-flesh of sexual intercourse. So, as long as:
- a couple is able to perform the marital act (sexual intercourse) to consummate, and
- they do nothing intentionally to impede its natural end (like contraception or sterilization),
there is no sin.
Peace,
Paul
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