it's crazy but many people believe it's actually possible.
We had a teacher at secondary school who told a story of a girl who, when she got pregnant swore she was a virgin. It was later found she had an intact hymen. That said, I suppose a committed sperm doesn't need to use the entire rocket ship if it has another launch pad... (whatever that means).
I wonder if the subsequent colour of the baby reinforces the case.
Maybe she should just check that it's really sun-cream she's rubbing on.