Learn English – the term for a person who doesn’t waste time

Aonanist. An onanist being a man who masturbates or practices coitus interruptus, an aonanist would be someone who doesn't (similar to social/asocial).

I don't think onanophobe is right because that would indicate a fear of onanism while there are certainly other reasons for not practicing it.

Equivocator. It means "to use ambiguous or unclear expressions to avoid commitment, or to mislead" (Dictionary.com).