Finding a partner as a mature married bisexual male can be challenging, but there are several ways to approach this.

1. Communicate with your spouse: If you are in an open relationship or have discussed non-monogamy with your partner, communicate with them about your desire to find a partner. Make sure to establish boundaries and discuss any concerns you or your partner may have.
2. Join online communities: There are many online communities for bisexual individuals looking for partners or connections, such as dating apps like OkCupid or Bumble, or forums and social media groups dedicated to bisexual individuals. Joining these communities can provide an opportunity to connect with others who share similar interests and orientations.
3. Attend LGBTQ+ events: Attend local events, such as Pride festivals or LGBTQ+ networking events. These events can provide an opportunity to connect with other bisexual individuals and potentially meet someone who shares your interests.
4. Seek therapy or counseling: A therapist or counselor can help you navigate your feelings and desires, as well as provide guidance on how to find a partner in a healthy and respectful way.
5. Be patient and honest: Finding a partner takes time and effort. It’s important to be honest about your intentions and desires and to take things at a pace that feels comfortable for you and potential partners.

Remember to prioritize communication, honesty, and respect in all your interactions, whether online or in person.