The stronger cavemen would stay up late fucking, therefore they slept late. The weak caveman's only opportunity to reproduce was to sneak in the fucking before the strong ones woke up. The weaker cavemen were smarter than the strong ones out of necessity.
Cavewomen accepted it because there weren't STDs yet, and orgasms are awesome.
To make a long story short, we are decendants of weak cavemen! O.O
The cave men who implanted their seed early in the morning before going into battle would have their genes survive even if they were killed later in the day. This gene-survival advantage might have been very small initially -- maybe just .01% or so -- but it could have become 100% dominant over say 150,000 generations of hominoid males slaughtering each other.
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