Having taught many 14 year old pregnant schoolgirls whose partners were over 18, I cannot remember one case of the male being prosecuted. I do remember having to deal with 14 year old girls sobbing and screaming because their babies were taken away from them.
Not forgetting the email from a 14 year old who had gone into labour, had no credit on her mobile, was alone in the house as her foster parent had gone out, not saying where she was going.
The law is there, but rarely brought into being.