The case for laptop computers kept on the lap when they're hot having an effect on this clearer because they can heat up the groin and part of the reason there is a ball sack hanging out of the body is to keep them cooler than the rest of the body, so heating them up is not a good idea if you're interested in getting a woman pregnant. This is not major worry though since apparently it is reversible if you stop using laptops this way. For a phone though unless it's hot, harder to understand why this would cause this.

I like how the articles specifies men's sperm as opposed to women's sperm. Although that does bring up a point about whether someone should research the effect on corresponding female parts.