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