Threesome

immature / misbehave

worldwide; global

Cultivate one's mind and improve one's character

Ambiguity

to refer somebody cannot settle down, or pay attention to things

(adjective) to have a bad memory; forgetful; scatterbrained

absentminded; forgetful

deep-rooted bad habits

hazardous; dangerous

usability

same-sex marriage

describes a person who doesn't know how to deal with people in a proper manner; to not understand the ways of the world

(slang) immature; not sensible

entertaining; entertainment value

practicality

adj; mandatory, compellent

compulsory; mandatory

flexible

Inevitability

noun; addicted to sex

Sexual orientation

a situation which is so important that it concerns people's lives

Sexual fantasies

(noun) personality

sexual dysfunction; sexual impotence

sex toy

scope

Inertial force

Law of inertia