Here is the language of Part 1 of the Bill. Sadly for km's legal world view, the words same-sex and marriage are treated as a valid legal descriptive term. Yeah for the UK.
Part 1 Marriage of same sex couples in England and Wales
Extension of marriage
1 Extension of marriage to same sex couples
(1) 5Marriage of same sex couples is lawful.
(2) The marriage of a same sex couple may only be solemnized in accordance
(a) Part 3 of the Marriage Act 1949,
(b) Part 5 of the Marriage Act 1949,
(c) 10the Marriage (Registrar General’s Licence) Act 1970, or
(d) an Order in Council made under Part 1 or 3 of Schedule 6.
(3) No Canon of the Church of England is contrary to section 3 of the Submission
of the Clergy Act 1533 (which provides that no Canons shall be contrary to the
Royal Prerogative or the customs, laws or statutes of this realm) by virtue of its
15making provision about marriage being the union of one man with one
(4) Any duty of a member of the clergy to solemnize marriages (and any
corresponding right of persons to have their marriages solemnized by
members of the clergy) is not extended by this Act to marriages of same sex