Bottom surgery refers to sexual reassignment surgery on the genitals. Transgender men and women may choose to have bottom surgery to affirm their gender identity. Bottom surgery is also referred to as gender reassignment surgery or gender affirmation surgery.
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Transgender individuals may choose to have bottom surgery so that their physical sex is aligned with their gender identity. Both male to female and female to male transgendered individuals can have bottom surgery. Typically, those that choose to have bottom surgery will have top surgeries performed first.