Can we ask that any sexual feelings or activity trigger healing sessions to be done by the higher selves with the LHP and DSMR protocols?

This can indeed be done. It is a human impulse and intention, at least to have the thought if not the deed, and as such, is fair game in coupling this to a request for the higher self to use it is a trigger to launch healing work. As you know, sexual feelings can be quite frequent, especially in the young, and can be both positive and negative with regard to intentions and the vibration of the being holding the impulse. Both are useful starting points to use the intention, and can be transmuted if on the negative side into a positive equivalent to support healing work.