Yeah, but that's like people panicking because they see the Samsung Health icon (female jogger) on their boyfriend's phone (which happens here as well). The fact is that if you are going to put a human in the icon people are going to interpret it as one sex or another, so whatever icon you use it's 50-50 that a suspicious or insecure partner will be worried if it contains a human figure. And as most cultures are sadly male-dominated (and I write that as a male myself) it's more likely that a generic icon will be seen as male unless made explicitly female, or a "male" icon chosen by default.
There's nothing remotely amorous or sexual about this icon. In fact there's nothing clearly male about it: "vaguely humanoid" is how I'd describe it. That is why I cannot see anything suspicious about it. It's more likely to be a contacts app or something like that than a dating app.
And as I half-jokingly said in another thread, if I were cheating I'd have more sense than to send screenshots with incriminating notifications on them to my wife. So never mind character, if you respect her intelligence the default presumption should be that something you don't recognise is innocent until proven otherwise.
The truth is that we get these queries most days, almost always the same story: "I've seen something I don't recognise and am worried that my partner is cheating on me". Mostly we can't identify the icon, because there are over a million apps out there and the elements that worry people most are incredibly common in many different types of app, but when we can it's almost always innocent.