Sensuality (766) (aselgeia [word study] from aselges = licentious <> a = negates next word + selges = continent) originally referred to any excess or lack of restraint but came to convey the idea of shameless excess and the absence of restraint, especially with sexual excess. Thus like koite, aselgeia was used almost exclusively of especially lewd sexual immorality, of uninhibited and unabashed lasciviousness. It refers to the kind of sexual debauchery and abandonment that characterizes much of modern society and that is often flaunted almost as a badge of distinction!
KJV: Wherein they think it strange that ye run not with them to the same excess of riot, speaking evil of you
NET: So they are astonished when you do not rush with them into the same flood of wickedness, and they vilify you. (NET Bible)
Young's Literal: in which they think it strange -- your not running with them to the same excess of dissoluteness, speaking evil