According to Osho, kundalini rising does not deplete meditative energy during orgasm if the orgasm is tantric—a relaxed 'valley' experience. Upward-moving energy harmonizes with deep, unstrained lovemaking and is even helped to ascend. Depletion and inner conflict arise only with the ordinary 'peak' orgasm that forces energy downward, which yoga resists; tantra integrates sex and meditation.
No—if you relax and love gently, your energy moves up and helps meditation; only a tense, peak-type orgasm pulls it down and drains you.