John Walker, 51, of Cotterells, Hemel Hempstead, will appear at Aylesbury Crown Court charged with two counts of rape.
The other relates to an alleged rape of a woman in Wembley, London, in 1987.
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The victim of an assault in Cippenham was flown to hospital by air ambulance this afternoon.
A rapid response vehicle, an ambulance officer, an air ambulance and an ambulance crew were all called to an address in Earls Lane at 2.10pm.