Choose a father, have him provide you with a sperm sample.

"More if the dog is male and could produce a sperm sample."

It is soon discovered that there are sperm samples on the dress.

Surely all we'd have to take out is a sperm sample.

If the doctor had looked a little farther down the victim's leg, she would have found a nice, big sperm sample.

She wondered what they would do if he failed to produce the sperm sample.

Maybe that was the reason behind this sudden talk of not providing a sperm sample.

I assume you collected sperm samples from men in both groups.

They were told to look at the pictures while producing a sperm sample.