A great movie that -- if you get a chance, see also the next by the same director, "Animals Are Beautiful People".
Waste is the nature of Nature -- she has no narrow efficiency.
The most prolific inseminator, for example, might father 100 offspring in a polyamorous or promiscuous culture, in the course of his life.
Those 100 sperms cells are a pittance, as there are over 40 million of them in each average ejaculation. In each successful act the efficiently used cells are 1/40,000,000 of the total spent. Suppose he has forty fertile years, and through whatever means available ejaculates once every two days (fairly conservative assumptions). Those 7300 instances would produce in the region of 292,000,000,000 sperm cells. Thus the efficiency factor in terms of productive application of potential is on the order of 1/2.920,000,000 (one in 2.9 billion). Wasteful? I swan. (Well, I don't, actually, but I know someone who does....).