If you're rich enough, you can import (now available for shipping to Singapore) an entire harem (say buy a new one every couple of few months?) of highest quality love dolls (average price approx Sg$15k excluding shipping), guaranteed STD free! (unless of course your greedy relatives / heirs want to hasten your demise and covertly lubricate your dolls with a cocktail of 10 deadliest STDs including AIDS/HIV).
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http://www.orient-doll.com
http://www.orientlovedoll.com
PS. Poor / middle income men, will just have to settle for the humble Fleshlight (at least it's still STD free... besides if you're a poor man, your heirs won't be interested in assassinating you).
https://www.fleshlight.com/