For me, being sucked by someone who's good at it, especially if we like each other (doesn't have to be love), is the greatest pleasure in life. Oral sex has always seemed more intimate to me, and as stated in previous posts to this thread, the attention paid to my cock while I relax & enjoy it is unbeatable.
I'm 61. I've been sucked by other guys (first time age 7, last time age 18), girlfriends, female co-workers, my wife, & myself (I can still do it), and every time has been a thrill. I get aroused just thinking about a woman making eye contact with me while I come in her mouth. My orgasms that way are much more intense than when I come in a vagina.
I like regular sex, but I'd prefer oral every time.