WHAT. QUESTION!??! Lol the sex question? One if he asks you, two if he stars at your boobs a lot, three if you make out a lot, four if he takes your breath away (not litterally)
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If he is acing slightly out of the ordinary or if he is acting nervous. Also if he invites you to go out on a date somewhere and he says it's really special and you aren't able to come because you...
You don't need to tell him, when the time is right it will happen naturally, when he feels ready and you feel ready it will happen. Maybe drop a couple of hints here and there, when it feels right...
Let him know that you love him enough to bring a child into both your lives that will be part of each of you. Let him know that most of all you want him to be the father of your child. In which case...