I have had two experiences that might be valley orgasms, but they did not have the bliss or fusion that is described, for example, in the article on magnetic sex. I sought neither experience and in both instances just kept relaxing during periods of fairly high sexual arousal. Waves that felt like releases came over me but did not exhaust me, sate me, or make me less interested at that moment or later in karezza.
Does this description also fit for you for some experiences? Might these be one type of valley orgasm?
Karezza with my beloved makes me very happy, but it is in moments of low arousal that I am clearer about why. When our sexual arousal is lower, I often feel the magnetic energy coming from his penis spreading bliss throughout my body. I believe that this also happens when sexual arousal is higher but the sexual feelings mask the magnetic ones. No orgasms yet to my knowledge at these times.
I look forward to your observations, too.