Married guy nakabuntis ng ibang girl:
If the girl is a minor- He may be liable for Simple Seduction under Art. 339 RPC and NOT Corruption of Minors. If the minor is below 12 years old, its already statutory rape regardless of any consent.
If the girl is of legal age:
a) consensual - none
b) with deceit - Simple Seduction (In case the girl is a widow and of good reputation) under Art. 339 RPC.
In addition, the married guy may be liable for Concubinage if the three circumstances under Art. 334 RPC are present, to wit:
a) keeping a mistress in the conjugal dwelling
b) shall have sexual intercourse under scandalous circumstances with a woman who is not his wife
c) cohabit with her in any other place.
Common to the aforementioned, is the civil liability of the married guy against the offended party/parties.
Bachelor nakabuntis ng isang girl:
If the girl is a minor - Simple Seduction plus Civil liability.
If the girl is of legal age - No criminal liability if its consensual.
Regarding recognition and support of the child, the putative father is liable for support of the child unless he files a petition to impugn the legitimacy of the child.
During the Birth of the child, the putative father has the discretion either to affix his signature on the birth certificate or not (Signifying recognition of the child). The mother, ascendants or the medical attendant has no right to fill the name of the father on his behalf in case the latter refuses to do so.
In case of illegimate children, they had the right to use the surname of the mother. HOwever, if the father acknowledges the child by express recognition(his signature on the birth certificate), or by photos/letters acknowledging the child as his, the child may use the surname of the father under the REVILLA LAW (without prejudice for the latter to file a petition impugning the legitimacy of the former.)