Unable to orgasm without voluntary pelvic floor contraction

Hi Everyone,
I noticed that while having sex with a partner (male), I can only reach an orgasm if I contract my pelvic floor muscles tight and masturbate my clitoris (while penetration). But surprisingly, I experience way more pleasure during penetration when my pelvic floor is relaxed. But even if the pleasure can be intense, I never reach orgasm this way. I'm concerned by not being able to reach an orgasm without masturbation, and through a process that isn't as pleasureful.
Anyone experienced the same thing and/or could give advice? Thanks