I understand both you and your husband's concerns regarding the "appropriate" degree and nature of physical affection that is healthy between a mother and her ten-year-old son. Your son is clearly comfortable with his physical exchanges of affection with you and you mention that he usually initiates this contact, even in front of peers. Adult-like lingering kisses on the lips and anything closely resembling the sexualized physical behavior between adults that your son has observed would not be healthy to exchange -- this could confuse and possibly trouble him as he grows into his preadolescence. But this isn't the behavior you describe.

I would not suddenly terminate displays of physical affection with your son. A peck on the lips or cheek and hugs from you are fine, as long as they do not produce discomfort or inappropriate responses from your son. At age ten, he is indeed becoming a more sexualized boy, as his hormones are kicking in. However your exchanges of affection may change, as he grows older, you never need to stop displaying some physical affection to him.

Physical displays of affection between sons and daughters and both their parents are healthy, positive, nurturing manifestations of the love and should continue as long as everyone is comfortable with these displays. Don't be surprised or take it personally if your boy stops initiating these displays of affection in front of his male peers. It may become "uncool" for him to do that soon because boys of this age think they are too old for that kind of "mushy stuff" -- at least in public.