It is important to approach such situations with respect and consideration for the other person's feelings and boundaries. Directly checking for signs of horniness may not always be the best approach as it can lead to misunderstandings or discomfort. However, here are some more subtle signs that a woman may be interested and open to being approached in a romantic or flirtatious way:

1. Body Language: If a woman is attracted to you, she may display open body language such as facing towards you, uncrossed arms, and maintaining eye contact.

2. Flirtatious Behavior: She may engage in playful teasing, light touching, or compliments towards you.

3. Initiating Conversation: If she goes out of her way to start conversations with you or shows interest in getting to know you better, it could be a sign of her attraction.

4. Proximity: If she purposefully finds ways to be close to you or initiates physical contact, it may indicate her interest.

5. Eye Contact: Prolonged eye contact or batting her eyelashes can be a subtle way of showing attraction.

Remember, communication is key in any relationship. If you are unsure about a woman's feelings or intentions, it's always best to approach the situation with honesty and respect. Consent and mutual interest are important factors in any romantic interaction.