Nelly, let them play with what they want to play with, not what is forced on them by only being told what to play with kwim? Kids will play with toys regarless of what 'gender' they are for because kids love toys fullstop and will investigate what they do and how they work regardless of whether it is a tonka truck or a doll. You see that a lot ot playgroup/preschool etc and there are just as many boys dressing up and playing with the dolls as there are girls riding bikes and playing in the sand pit. I think I may have said this in an earlier post in this thread (if not this one certainly one of the other threads similar to this) but for our DD2's 4th birthday last year we got her a John Deere front end loader because that's what she wanted and we weren't going to tell her no, she couldn't because it wasn't a girls toy. I think if you just let them be kids, and not mini versions of ourselves then you can't go wrong kwim because kids aren't born with gender bias - it's something that's imposed on them as they grow.
spot on - yep know what you mean. Have a mix of toys rather than just "girl" or "boy" so they can direct their own play.