BITTER blonde infected with the Aids virus went on a vengeful mission to spread the disease. Sarah Jane Porter, 43, was made HIV positive by a black lover — and set out to pass it to other Afro-Caribbean men. She is thought to have had unprotected sex with DOZENS. The single mum, of Kennington, South London, was yesterday jailed for infecting one ex — and branded “pure evil”. A former lover of Porter told last night how she set out on a callous “payback mission”. The 37-year-old man — known as Mr B — called her “sick in the head”....