Heaven doesn't like gods doin' the nasty with nig...I mean mortals, so when Keiichi made his contract with Bell, they (deep breath) took away his libido. That's of course why he never made a move. He was basically castrated the whole time. Bell knew about this...but went along with it because she liked being pampered and showered with unconditional no-sex love by him. Their whole relationship was based on mind control.
So yeah, all these kinky pics could just possibly be canon. Yeah, plenty of married lechers genuinely love their spouses, but they often keep going to their paramours because only they can press their carnal love buttons in that special way.