Found this link:
Seems pretty orthodox:
Using sperm or ova from a person outside the marriage to conceive a child is never permissible. **
[size=2] First of all, the use of donor sperm or ova violates the *unity of the marriage*. (4) When a man and a woman marry, they give themselves exclusively to each other. The selves they give are sexual and procreative beings. A husband and wife violate their marital commitment if they give themselves to another in sexual union. Similarly, they dishonor their marital covenant if they choose to exercise their procreative powers with someone other than their spouse. (5)
Second, the use of donor sperm or ova can seriously *disrupt and confuse family relationships* *for the child. *(6) For example, the sister or sister-in-law of the wife could donate ova, with that woman subsequently being both the mother of the child from a biological point of view and the aunt of the child in terms of social relationships. Or again, it is possible for a daughter to donate ova to her own mother so that her mother may have another child later in life. In this case, the daughter would be the child's mother biologically and the child's sister in terms of social relationships. The mother would be the child's grandmother from a biological point of view and the child's mother in terms of social relationships.
Similarly, sperm might be donated by a brother or brother-in-law of the husband, with that man subsequently being the child's father from a biological point of view and the child's uncle in terms of social relationships. Further, it is not inconceivable that a father donate sperm to his biological son, so that he would be both the child's father biologically and his/her grandfather in terms of social relationships. Indeed, since sperm can be successfully frozen, a child could be conceived using sperm taken from a man who has already died.
These examples illustrate the rupture between biological parenthood and responsibility for upbringing that current reproductive technologies have made a possibility with the use of donor sperm or ova. Such a confusion of relationships is not fair to the child because it can adversely affect the child�s personal identity and relationships within the family.
[/size] Other subjects addressed:
**3) The conception of a child must be brought about as the result of an act of sexual intercourse between spouses. The unitive and procreative aspects of the conjugal act should not be separated. Fertilization should not occur as the direct result of a technical process which substitutes for the personal act of sexual intercourse between spouses.
4) The use by spouses of technological methods in reproduction is not entirely precluded, but such methods must meet the following condition to be permissible: the method must * facilitate* the natural act of sexual intercourse or assist that act to achieve its objective of conceiving a child once it has been naturally performed.
5) Techniques of assisted reproduction may not be used which involve the deliberate destruction or wastage of human embryos.
COUNSELING INFERTILE COUPLES