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From what I understand the "sperm wars" theory has been pretty much shot down as inaccurate. What they actually found was that the more monogamous the species was the lazier and more defective their sperm was. Critters like gorillas had a high percentage of sperm cells that swam in circles or had two tails and basically did the sort of things that were supposed to block competitors sperm. In gorilla society however none of that was necessary since the females only bred with the dominant male. Chimps, spider monkeys and other promiscuous species on the other hand had very few of these "blocking sperm". They instead produced much larger quantities of fast, healthy sperm and the more promiscuous the species was the higher the count was of healthy, "normal" sperm and the lower the percentage of the supposed "blocking sperm".