25%

The Sunday Telegraph (Sydney) - Body and Soul - - NEWS -

That’s how much a man’s sperm con­cen­tra­tion in­creases by if he wears box­ers in­stead of briefs, say sci­en­tists at Har­vard Univer­sity in the US. Box­ers may also boost your lev­els of motil­ity ( sperm that are able to fer­tilise an egg), so if you’re try­ing for a baby, start by swap­ping those tighter-fit­ting undies for looser styles.

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