In order to understand human sexual development, we must recognize that sexual development takes place throughout the lifespan. in other words, it begins in and continues through

It begins in "womb" and continues through "old age".

Human sexuality is simply the way individuals experience and express themselves sexually. This includes natural, suggestive, physical, passionate, social, or profound sentiments and practices throughout an individual’s course of life. In its different structures it begins from the womb of a mother and until old age keeps developing in one way or another.