The English word "Gay", apart from meaning "happy", "pleasure" or "joy", is also used to refer to homosexuality. In usage, except when quoting past literary works which use its original meaning, or aside from banter and word games, in daily life the original meaning of "happy" is basically no longer used.
Source: Xingfu Bar (www.xingfu88.com). For detailed reference, see: http://www.gay5.org/html/zishi/200808/30-64.html