Continuous Glucose Monitors Show Sex Is Safe in Type 1 Diabetes

Objective Glucose Tracking During Sexual Activity

Sexual intercourse does not cause clinically significant hypoglycemia in adults with type 1 diabetes, according to observational continuous glucose monitoring (CGM) data presented at the European Association for the Study of Diabetes (EASD) meeting. Dr. Dominica Orłowska and colleagues at the Medical University of Warsaw evaluated real-time metabolic shifts during intimate activity.

The study tracked 12 adults with type 1 diabetes (T1D), consisting of seven women and five men with a median age of 36 years. Participants wore either a FreeStyle Libre 2 or Guardian 4 sensor over a three-month observation period.

The research team analyzed sensor readings from two hours before each sexual event until six hours afterward. Participants marked 110 total intimate encounters in their monitoring applications.

Divergent Glucose Trends Across 110 Tracked Events

Blood sugar levels can either rise or fall after sexual activity, with both directions occurring across different sessions in the same individual. In 64 events (58 percent), mean glucose decreased from 180 to 132 mg/dL, reflecting a statistically significant 27 percent reduction. In the remaining 46 events (42 percent), glucose increased from 122 to 164 mg/dL, representing a statistically significant 34 percent rise.

Starting glucose influenced the magnitude of the shift. Higher pre-activity blood sugar led to larger post-activity reductions when glucose was falling, while resulting in smaller rises during upward excursions.

Timing, Body Mass Index, and Pump Management

Nighttime sexual activity produced a measurable drop in blood glucose, whereas daytime encounters caused no meaningful change in sensor readings. Across 66 nighttime events between 8 p.m. and 6 a.m., mean glucose declined from 165 to 147 mg/dL. Across 44 daytime events between 6 a.m. and 8 p.m., mean glucose remained virtually unchanged, moving from 144 to 143 mg/dL.

Participants in the higher body mass index (BMI) group of 25 kg/m² or greater experienced an average decrease of 10.7 percent, falling from 150 to 134 mg/dL. Participants with a BMI under 25 kg/m² had an average reduction of 5.6 percent, moving from 159 to 150 mg/dL, which did not reach statistical significance.

• All six pump users chose to remove their devices during sexual intercourse.
• Changes in blood glucose were unrelated to insulin delivery mode or duration of diabetes.
• No significant differences appeared between readings taken at two hours and six hours following intercourse.

Study Limitations and Clinical Implications

The small sample size of 12 participants limits how broadly clinicians can apply these observational findings across larger populations with diabetes. Earlier inquiries into intimacy and diabetes relied solely on retrospective surveys, where roughly one-third of young adults reported fear of low blood sugar. This investigation provides the first continuous sensor data recorded during intercourse, yet individual glucose responses still varied between sessions.

Patients managing type 1 diabetes can talk to their clinician about personal activity trends and insulin pump suspension strategies during intimacy. Checking personal continuous glucose monitoring patterns after physical activity can help clarify individual night and day responses.