Of course not normal. And even strange. Oral sex is only part of full sex. And not everyone, by the way, likes this part. Sex itself is much more diverse, and you shouldn't be limited to just a small part of it.
This is awesome! Strength gymnastics, massage, mud baths, Charcot's shower, full-fledged sex with a PERMANENT partner (without contraceptives and a spacesuit) have a positive effect on human health.
Sex is not emotional and physical relaxation, for this there is fitness and dancing.
The fall in morals happened precisely because of the depersonalization of sex to the level of masturbation (physical and emotional release). Previously, it was the merging of two bodies for a new life, but contraception allowed women to make sex another pleasant addition to chocolate, coffee, cigarettes, wine ...
Having exclusively oral sex is wonderful and affects the health of the participant only positively, like joy and laughter.
With vaginal stimulation, oxytocin is released, which, among other things, increases attachment to a partner. Otherwise, I don't see much difference.
Sex is that, emotional and physical release. So, if oral sex brings you the same pleasure as "standard" sex, if you can, excuse me, to cum in your hands.