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