KGarrard, you may be correct. From what I've been able to find out, the IOM was more lenient towards the rights of illegitimate children than other places.
That's not quite right.

The church was determined that an illegitimate child would not be a burden on the parish.
So, the purpose of the "Presentment for Fornication" was to persuade the mother to name the father of her child, so that he could pay for the child.
Failure to name the father resulted in a fine of 2s 11d!
The Presentments are available at the Manx Museum Archives.
They are hand-written, and in pencil. There is no index!