1) Acrobat 2) Goodtime charley 3) Hepcat 4) Hinge 5) Jitterbug 6) Simian 1) Athlete 2) Jet set member 3) Jet-set member 4) Jock 5) Lothario 6) Playboy 7) Promiscuous person 8) Tarzan was one 9) With-it one 
• (n.) One who swings or whirls. • (n.) One who swinges. • (n.) A person who engages freely in sexual intercourse. • (n.) A person who engages frequently in lively and fashionable pursuits, such as attending night clubs or discos. • (n.) Anything very large, forcible, or astonishing.
Swin'ger noun 1. One who swinges. 2. Anything very large, forcible, or astonishing. [ Obsolete or Colloq.] Herrick. Swing'er noun One who swings or whirls. 
Swinger is slang for a person regarded as being modern and lively.
[n] - someone who swings sports implements 2. [n] - a person who engages freely in promiscuous sex
slang for a promiscuous person who regularly swops sexual partners with other
noun a person who engages freely in promiscuous sex
a person or thing that swings. · a lively, active, and modern person whose activities are fashionable or trendy. · · a person who indulges in promiscuous sex. · a person who engages in the exchanging of spouses for sexual activities.