In theory it's true. In reality, it's doesn't really matter because nobody has ever been able to show that it makes enough difference to notice. With couples who are trying to have children, some men will wear boxers instead of briefs but it's not known if this actually helps. Long story short, don't bother changing underwear just for sperm count.
If he looks better in boxers, maybe he might want to wear them for you. Otherwise just pick whatever he's more comfortable in.
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