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The scientific name of the subject is maeiusophilia;
however, the previous author is on the money on the definition:

Some guys (and some girls!) get turned on at the
sight of a pregnant woman.
When I saw the girl next door was 8 months pregnant,
I had suddenly gotten one helluva boner!

Who knew that I was a maeiusophile...
... a pregnant fetish-kind of guy?

by Wallaroo November 11, 2005
Being turned on by pregnant chicks, especially those who are lactating.
When both of my hot neighbors were similtaneously pregnant i discovered my pregnant fetish
by The Kryptonian April 03, 2005