Your preschooler's personality is becoming more defined! This is an opportune time to provide them with opportunities to develop according to their natural bent.
Affirm your child's masculinity or femininity as they discover the social and behavioural norms of being male/female.
Teach your child the correct (scientific) terminology for the various body parts and tell them their genitals are private and not meant to be shown in public.
Without intentional effort, sex can easily and quickly become mundane and predictable and can even turn into a dreaded necessity to place on the 'to-do' list. Having a great sex life is only possible when both husband and wife make it a priority to work on intimacy together.