I remember only a few minutes of a porn film/clip and I'm looking for its title.
A young man and young female are having sex, another lady arrives in the yard and watches them having sex. In the middle of the sex, the cell phone of the woman having sex rings and her boss asks her to go to work. So, she dresses up and leaves without finishing sex.
It should be a 10-15 years old film.

I'd appreciate your helping me find the title of that film.

本作的核心特色【避青入红】取材自制作人自身亲历为期三年的中国传统武术修炼，其中“避青”指的是避开敌人锋芒，灵活躲避，而“入红”指的是趁势反击敌人要害。听起来大概就是几乎所有动作游戏适用的规则：防守反击。但在本作里，被提炼为一个具体的战斗系统之后，想做到灵活避青入红还是有点复杂的。
避青入红的具体操作方式：在按住防御键（默认L1）的情况下，拨动右摇杆的功能就不再是调整镜头了，而是对应三种“避青”动作，这三种动作分别对应着上，中（左右），下三个方向的攻击，玩家要做的就是按住防御键，判断敌人攻击动作的方向来源，然后在被击中的前一刻推动右摇杆来实现避青。
不管敌人的攻击来自什么方向，只要玩家在被攻击的前一刻成功朝任何方向推动右摇杆，摆出上，中，下任何一种避青架势，都是成功的避青动作，成功的避青不但可以无消耗规避敌人的攻击动作，还可以派生独特的后续招式瞬间提高战斗节奏，或触发装备特效带来收益，总之好处多多
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This sounds oddly familiar—years ago I stumbled on something similar while browsing, and the abrupt “boss call” twist really stuck with me. Couldn’t find the exact clip back then, but sites like hentaiz https://phimhentaitop.com had tons of hentai videos with those little surprise interruptions that make scenes memorable.