Not having the right partner is an opportunity, so let's start with a different sort of inventory: What have you learned about yourself and your needs from your past failed relationships?
'Threading the needle,' so to speak, can seem daunting when you're balancing raising your children with sowing the seeds for a fulfilling romantic and sexual life. If you proactively set some ground rules it can make this far less daunting, and even far more empowering for your children.
It's important for parents to emulate the behaviors necessary for a successful relationship. This includes the modest, but regular phenomenon of 'mommy and daddy time.'