Every company I've worked for (all US based) has had corporate policies on just this subject, because they are aware that this is a major danger for them, either giving or receiving. When I worked for a government contractor we weren't even allowed to give rides to government employees in our rental cars when we were all together on a business trip, to make sure that even a line that trivial was not crossed.

Generally, the company will have a limit (somewhere in the $25-$50 range) on gifts you could give or receive without prior authorization. So maybe I can take you to a bar or coffee shop and get you a drink or two while we talk. But not a dinner at a high end restaurant, or a sporting event or a vacation in Hawaii, because the risk of being corrupted (on the receiving end) or reputational risk from being seen as corrupt, was too great.

This is particularly potent issue for American companies because of the Foreign Corrupt Practices Act. The FCPA means that US companies (and their subsidiaries, contractors, etc.) have to draw these sorts of lines over the entire world, or be subject to heavy penalties, even in countries where it might be more common and legal.