Meh. Indy may be a player, but he eventually settles down and marries... hopefully... a certain Miss Ravenwood.
Remember, he has a daughter in YIJC, if you count that series as part of Indy's timeline. He stuck it to someone obviously. Indy's an old-fashioned man of his word, so I like to think that he was a good father and supported whomever he got pregnant, Marion or not.
I think he went the old-fashioned way and got married, though. He married Dierdre, after all, and I personally do count her in in Indy's life. Even though Indy is a ladies' man and can be somewhat of a scoundral, I think when it comes to a serious relationship Indy is totally sincere. I wouldn't have him any other way or I (and thousands of other female Indy fans) would lose respect for him.
Granted he was a total arrogant jerk towards Marion ("You knew what you were doing" and "trust me" with a sarcastic sneer), Wille ("I don't like to prejudice my 'experiment', I'll let you know in the morning) and Elsa ("You like the way I do things"), I think he would make a devoted, if somewhat aggrevating, husband. Marion would be my choice to put Indy in his place when he got too uppity. I bet Marion is the only woman that can raise her fist to Indy and make him flinch! Then I'd have her punch him playfully in the arm-- "Ha ha! Made you flinch Juuuunior!" to which Indy would sneer and tromp into the kitchen for another cup of coffee, grumbling the whole way... hee hee! Either that, or he'd roll his eyes and point his finger at her and wag it, which is another one of his trademarks (actually, I call it the "Harrison Ford Finger." Watch any one of Ford's movies and I guarantee it'll appear, especially when his character is angry).
Also, I think that to honor her dad Marion would have her last name be Ravenwood-Jones. Or do you put the married name first? Either way, Indy loved Abner so he wouldn't mind at all. Just my HO.