Relier Pairs Developmental MilestonesVersion en ligne When do you believe these behaviors first appear in a young person's life? par ISRC Widener 1 Become aware of how their body functions 2 Have an understanding of their own sexual orientation 3 Experience an erection or vaginal lubrication 4 Begin to recognize traditional male and female gender roles 5 May engage in same-gender sexual exploration 6 Value privacy highly 7 Feel curious about bodies 8 Touch their genitals for pleasure 9-12 years old 13-17 years old 6-8 years old 4-5 years old 4-5 years old 0-3 years old 0-3 years old 4-5 years old