Conventional Romance. I feel like most modern mainstream adult romance novels are on this level. Physical relationships between characters include 1-3 descriptive open door love scenes. The intimate acts described in these books are usually what is considered conventional (a.k.a. second base, third base, home run, etc.)

Examples: The Hating Game by Sally Thorne, The Love Hypothesis by Ali Hazelwood, the Bridgerton series by Julia Quinn, To Have and to Hoax by Martha Waters, He’s a Keeper by Stacy Travis, and most books by Penny Reid.