This is another one of those self-knowledge questions. Think of what goes on for you around sex and ejaculation. That will definitely help.
First identify important change themes. What kinds of issues, challenges, obstacles are coming up and what changes would help with those issues.
Examples
Relaxing more: Harmonic Singularity
Feeling sexy and confident about my appeal: Earthshaker, Ascension, Lion IV, Power Awareness, and Libertine
Getting the focus off of me and onto her: Empath
And so on.
EDIT
Another important one
Being in the moment and enjoying it rather than being super performance focused:
Joie de Vivre, Ego Adsum, etc.
Also think about what your sex related strengths are, not just the weaknesses that you’re working to overcome. What are you already good at?
Making a mental/personal connection? Add Transcendental Connection and supercharge that strength
Think about your own qualities. You’ll find some awesome ones. Consciously integrate those into your sexuality.