Answer:
Volunteer bias.
Step-by-step explanation:
The sexologist may be defined as the individuals that are expertise in the field of topic and concepts related to the study of the sex. Sexology includes the scientific study of the human sexuality.
Volunteer bias may be defined as the individuals that willingly participate in the research method. This volunteering might affect the the thinking and can develop the different approach towards the life. This research sometime can also bring inaccurate conclusion.
Thus, the answer is volunteer bias.