A young woman visits the doctor for a breast examination. When he sees her he is surprised to see an ‘O’-shaped mark on her chest. ‘Oh’, she explains. ‘That’s from my boyfriend’s Oxford University jumper. He likes to wear it when we have sex and the crest rubs against my skin.’ A couple of weeks later, another girl is in for a breast examination. She whips her top off, and there is a ‘C’ in the middle of her chest. The doctor raises an eyebrow while the girl explains that her lover likes to wear his Cambridge University jumper during sex. Weeks later, a third girl comes in for an examination and she has a ‘W’ on her chest. ‘Ah!’ cries the doctor. ‘Let me guess, you have a boyfriend at Warwick?’ ‘No,‘ smiles the girl. ‘I’ve got a girlfriend at Manchester.