The human brain is easily bored (yes, even amidst sex) that there are many happily married couple who would forgo sex and instead watch a comedy show. The operative word to remedy the situation is, of course, Variation. Here is an interesting read on this subject, especially the comments, at NY Times.
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A few weeks ago PNAS published a paper on the evolution of snake sex chromosomes. The authors compare snake sex chromosome evolution with that of mammals and birds.
A few months ago I wrote the following:
Yet another piece of evidence for the futility
I'm tempting the fates by putting my words above the fold this time.
lol... thanks...
LOL :)))