Making love for a charity?

Soon, I am going to be in Birmingham, UK for a month (extended). In my farewell party ,my friends said if i managed to sleep with an English lady, They would donate �10 each to a charity ( 5 friends), if could not, i have to pay for their drinks all night when i come back. Any tips where can i find such a Nobel English lady who would agree to join me for such a lovely cause and victory over my friends. if you are the one, please e-mail me.