How synthetic hormones may play a key role in our sexuality 

Meredith Elliot says she was 'boy crazy' as a schoolgirl. All she ever wanted was a boyfriend — in fact, she had 'too many to count' in her teens. It's safe to say that at no point did she ever question her sexuality.

She went on to marry at 32 and was planning on starting a family with her husband when she experienced a sudden, dramatic turnaround.

'I started to notice women in the street,' says Meredith, a 43-year-old events organiser from . 'To be frank, I began to experience overwhelming fantasies about wanting to have sex with them.

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