Sex, as the most complex form of expression of physical desires and emotions, is the most enjoyable without the use of a condom.
It is quite simply an intoxicating feeling to physically feel the body of your partner/partners and all their vibrations,because sex is really enjoyable when you can experience that the act is a really frenetic experience for your partner, and the condom is an obstacle in this!
A liberated sexual act without a condom is simply an ecstatic experience, but mutual trust is definitely necessary to abandon the condom, as every sane person wants to avoid sexually transmitted diseases and unwanted pregnancy.