The "gay lifestyle" is a stereoytpe used by social/political conservatives to describe gay men being promiscuous, drinking, bar hopping, using drugs, cross-dressing and orgies.
However, heterosexual men and women engage in most of these behaviors as swingers, during beach week and spring break, in Las Vegas, on Miami's South Beach and at fraternity and sorority parties.
"Gay lifestyle" is a term is used by conservative homophobes to vilify gay people. When people are asked what gay lifestyle means most of them will only mention things that elicit a negative response: Drinking, drugs, promiscuity, cross-dressing, bar hopping and orgies. They seem to neglect the fact most of these things (with the possible exception of cross-dressing) are parts of straight society as well.