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The initial cell formed when a sperm has fertilized an ovum, which then travels down the fallopian tube for a few days, dividing into a larger cluster of cells to become a blastocyst

A sexual partner who is inserting a part of their bodies into a partner’s body in some way.

Pressing one’s lips against someone else’s lips or some other body part to express affection and/or to seek out or provide sexual pleasure. May also include the tongue.

Made up of two things or parts; a system with only two possible options or parts.