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I'm not an SEO expert by any stretch of the imagination but, I'm guessing it probably has something to do with linking between your own pages.
Let's say for example you have a big tits site which has a /big-tits-pornstars page. Any link on your site to that page you'd wan to link with the term "big tits pornstars"
When you're on your homepage, it doesn't hurt to have a link pointing to your own page for the term you want. Because after all a link is a link even if its for the page you're currently on.
Just my own opinion of course. I'm sure some of the actual SEO guys have clearer and more accurate answer.
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