Hi Rachel,
County Hall in Swansea will have PR's for the Gower churches. They have facsimile books for most of the churches around Swansea and Gower which are easy enough to browse through. They also will hold them on Fiche.
(Neath and Port Talbot will probably hold them too and maybe Cardiff - you'll have to check with them if these do- I've only ever used Swansea archives myself)
If you can't get to Swansea County Hall to view them( or any of the other above archives) you can purchase the PR booklets at GBP 3.00 each (or fiche at GBP 1.07) for the below churches from the Glamorgan History Society
St Cennydd's ( in Llangennith) PR's - baptisms 1671 to 1925, burials 1671 to 1971 and marriages 1671 to 1950
St Madoc's( in Llanmadoc) PR's -Baptisms 1683 to 1925, burials 1672 to 1989 and marriages 1672 to 1950.
St Cadoc's (Cheriton) Baptisms 1672 to 1925, burials 1672 to 1991 and marriages 1671 to 1950
Hope that helps
Kind Regards
