Parental bonding...

so im 18, and my dad and i have just recently started bonding. 6 months ago, i could never have done anything fun with my dad, but now, i feel comfortable with most things. i mean, tonight we went to a bar together and saw a movie, which we both found hilarious (burn after reading). we talk a lot about politics together. he takes me seriously.

my parents havent met all my friends, but they met some of them. many of the friends that i tell my parents about are girls, and they assume things that arent true. i havent reached the stage where i can talk to my dad about relationships and sex and whatnot. how do i get to that stage without it getting awkward? as a child and teen, i have been kinda prude, and i have never talked about relationships with my parents. the occasional joke comes out, though.

and i dont want my mom to be involved with this. my mom would be completeley out of it because she doesnt have lets say, “life experience”. she, as a child was very quiet and shy, while my dad was a hippie.

so, to summarize, how do i make a smooth transition into talking about “life” with my dad?