I think it would be great to be able to tell what to do every day, when not to take it. I feel we're going to have a lot more to do when we get closer to our partners. But the research found that, as young men grow their interest in sex and get older, their urges grow stronger in the presence of females. For males, meanwhile, the fear, says Pertwee, is the desire for intercourse — a feeling that has been associated with feelings of longing for sexual relationships through the ages. In a sense, the desire [is] that male sex [was] going to take on the importance and significance and we can't get past that. And what's still the most mysterious — and so far difficult — aspect of the male experience? The subject comes up in a major study of the male and female brains published today in the British Journal of Psychiatry.