Unfortunately, we "play God" every time we concieve a child and see it through to birth. I think in the case of articificial insemination, that there is an excessive amount of opportunity for one person to pass genes on to future generations, compared to natural procreation.
Usually, a man is limited by his personality, lack of good looks, or some other factor that keeps him from being able to impregnate too many women. Thus, a man who might otherwise be considered a less-than-desirable mate in the wild, and therefore unable to procreate, could become over-represented in the gene pool, as it were. It is possible that marriage as an institution originated in part as a means to keep men from becoming similarly over-represented. I think it may be time to put a limit on how many times a sperm broker can broker any one man's sperm.
In dogs we call this the popular sire effect. It IS something to consider.
susie
Conception often happens against man's will and it often doesn't happen when someone wills it. And besides, letting *nature take it's course* is absolutely not the same thing as designer babies where someone gets tested and a bunch of eggs get fertilized and the best are picked out. THAT'S playing God.