There are multiple sensations in vaginal intercourse that are interfered with by barriers such as a condom..
Thermal transmission is dramatically reduced because of the insulation qualities of latex rubber...
direct moisture transmission is eliminated.
What she feels is the surface contact of latex rubber not a penis in her vagina and his glans is totally isolated by the same materials he is not FEELING her vagina, labia or her warm secretions and lubrication...
He ejaculate if at all - into a condom, she does not feel the expulsion of semen in her vagina or on her cervix... that hot load of cum is trapped in a condom not deposited in her vagina...
The answer for us was monogamous bareback sex with an IUD when she was still fertile..
Honestly if it were a choice between jerking off and sex with a condom... I think my hand is the superior choice between these mediocrities...