(Longish - see TLDR as needed.)
I'm 63 and uncut and very, very clean. I don't think my folks (mom RN) believed in circ's anyway, but I was apparently not only premature but very, very sick after birth with some degree of hydrocephalus to the point my mom was praying for me to live. And this was 1952 in a very foreign country - thank heaven for US Army docs. In any event, I suspect that OP's interesting habit and its attractiveness or not is really, at least to some significant extent, a matter of degree, technique and timing. I've always been meticulous about washing every nook and cranny of my penis and especially foreskin (FS) and associated skin folds even when I was a teenager, and still do. I've also always done it with mild bath soap and water, though I recently learned on another forum (Reddit) that there's a vocal group of men who feel strongly that soap shouldn't be used because it dries out their penile/foreskin tissues too much and becomes irritating. I've no idea of the proportions of the groups, but those of us using soap seem equally dedicated to our method, mostly because we think it cleans better and is not irritating at all. But either way, especially with a FS, you have to (as in MUST) a) wash frequently enough, and b) wash very effectively and not just spray some water at your equipment and think it's clean. My only experience is with a FS, but there are an awful lot of folds, nooks, crannies and hiding places under and around mine, so it's not too hard to miss spots if you don't really try to be thorough. I've never had a single complaint from any ex-wife or GF about odor or putting it in her mouth, and I'm the sort who likes to talk about sex in great detail with partners, so I should have heard about it if it was a problem. There are also other possible difficulties with thoroughness. My particular equipment is very flexible and easily and painlessly moves all the way from more than covering the glans to full retraction in complete comfort. Other guys may have much different experiences anywhere from frank phimosis to a tight circ that allows relatively limited movement to simply being bored or even embarrassed to handle themselves properly for cleaning.
I don't make a habit of feeling and smelling my penile/FS tissues like the OP, but after I'm washed and dried out, I'll usually do it once just before dressing to be sure I'm as clean and aroma-free as I think I am. As I said, I use soap and water, most recently Safeguard, so I usually have a faint soap smell there, but otherwise nothing noxious. Now I can't speak for any of the women here, all having expressed valid opinions, but if my exes had decided on some frisky time just after I'm post-shower as described, they obviously felt that I was clean and odor-free enough to make their experience enjoyable. However, for me or any other man having been very clean post-wash, even with no pre-come to deal with, we're going to gradually develop an aroma or odor the longer you wait afterward, simply from bacteria plus natural skin secretions producing unpleasant compounds. That could be 30 minutes or a day or more depending on multiple factors including the guy's skin environment and activity level mixed with the woman's olfactory skills and prior experience. Mashie's experience with unpleasant medical smells has killed it for her intimately, which makes unfortunate but reasonable sense. Your mileage may vary.
TL😁R: What all of this is attempting to say is just that while OP's habit may strike some as an individual kink he frequently enjoys but which sounds unpleasant for them, it's not so unreasonable, depending on when he does it and the last time and thoroughness with which he washed. I do think his comment about "aroma" an hour after pre-come may be the straw that broke the camel's back for many. The impact on his partner(s) or on someone answering this question depend on so many different factors that I just find it hard to flatly call it gross or disgusting. With or without enjoyment of his habit, he and his partner(s) need to come to an agreement on an acceptable hygiene practice.