Image: Flickr/Tammy McGaryHow much sex a person has is the result of many factors... but are there any that seem more important? To find out, these researchers collected data from 254 women in their thirties, asking them about their personal and physical lives. It turns out that over 40% of the women sampled had sex at least twice a week, and that obese women were more likely to have sex at least three times a week. I guess they really don't call it the "dirty thirties" for nothing! Factors Related to Coital Frequency of Women in Their Thirties. "This cross-sectional study aimed to identify factors related to coital frequency (CF) among 254 women in their 30s using a semistructured interview to collect sociodemographic, anthropometric, reproductive, clinical, and relationship data. CF was characterized as (a) never, (b) rarely (≤1 times/month), (c) occasionally (≤1 times /week), (d) regularly (2-3 times/week), or (e) frequently (>3 times/week). The mean age was 34.38 ± 0.43 years, mean body mass index (BMI) was 27.86 ± 6.52 kg, mean family income was US$1,044.18 ± 796.19, mean number of children was 1.71 ± 0.89, and mean relationship duration was 8.87 ± 5.11 years. Eighty-seven women (35.2%) were taking hormonal contraceptives, 143 (98.0%) were employed, 239 (96.48%) had a secondary or higher education, and 9 (3.62%) had primary schooling. CF was classified as >3 times/week in 22 (8.66%), 2-3 times/week for 98 (38.58%), ≤1 times/week in 40 (15.75%), ≤1 times/month in 14 (5.51%), and never in 5 (1.97%). Women who reported having coitus >3 times/week a week had significantly higher body mass index (BMI; 32.72 ± 7.42 kg/m(2)) than those who had coitus 2-3 times/week (28.45 ± 6.76 kg/m(2)) and ≤1 times /week (26.81 ± 5.39 kg/m(2)) (p < 0.01 for both comparisons). Thus, coital frequency varies in women in their 30s. Obese women had a higher CF than normal-weight and overweight women." Related content: Sex Differences in Approaching Friends with Benefits Relationships.Science proves women who wax have better sex.Science proves women do have better taste.