How do I focus from the distraction of people who look attractive? I am a 21 year old college student studying physics. When I walk around campus, I am in a meditative state; enjoying the surrounding nature and the mathematical fruit it bears.
My thoughts become interrupted when an attractive woman will walk by me. With something as simple as an exchange of smiles, or simply their youthful beauty, I can be completely removed from my meditation. Commonly, I am left feeling like what I am pursuing is not as interesting as the passerby.
I do not want to be distracted from my meditation; more importantly, left feeling like my path is wrong and lesser. After I collect myself I can regain the motivation to pursue my maths and physics meditation, but this back and forth process feels burdening.
How do I incorporate the beautiful youth around me into my meditation of math, physics and nature, instead of being a process like a type 1-a super nova, where the youth is the white dwarf consuming the star of meditation?

edit - describing my meditation
Periodically, I will focus on my breath doing a samatha meditation. When I look at nature I try to understand impermanence, but I do not believe all things are temporal. I believe symbols/ideas like the hexagon transcend time. My meditation also consists of trying to understand the objects that exists whether I am here or not (maths) and the transducer (physics) between these symbols/ideas and the temporal physical world.
Since you are philosophical, ponder: "What is beauty? Why does it exist? What is its purpose?" 

In Buddhism, five questions are always asked about a thing:

(1) How does the thing arise (samudaya)? 

(2) How does the thing pass (atthaṅgama)? 

(3) What is the attraction (assāda) of the thing?

(4) What is the drawback or danger (ādīnava) of the thing? 

(5) What is the method to escape (nissaraṇa) the danger? (which may include, with some things, escaping the danger while utilizing the attractive quality.) 


  Bhikkhus, the uninstructed worldling does not understand as it really is the origin and the passing away, the gratification, the danger and
  the escape in the case of form, feeling, perception, volitional
  formations and consciousness.
  
  But, bhikkhus, the instructed noble disciple understands as it really is the origin and the passing away, the gratification, the danger and
  the escape in the case of form, feeling, perception, volitional
  formations and consciousness.
  
  SN 22.74