I considered taking a picture of my jeans crotch, but decided that might be a bridge too far, so here are actual models showing off a crotch gusset.
https://images.app.goo.gl/FSkf7Yh6giMgwV3V7
https://cdn.shopify.com/s/files/1/1707/5207/files/DTW-211028-1528_480x480.jpg?v=1645222672
Merch
https://www.redbubble.com/shop/ap/126401452
