Random allocation of study participants to the two groups of the Sexual Health Improvement Program and the Hold Me Tight Program is done using the permutation block method. The randomization sequence is determined by a bio-statistician and is obtained by considering 15 blocks of size 4 and 1 block of size 6 after generating random numbers using software online (using the site www.random.org/sequences/). For blocks of four, each random number will be assigned one of the following permutations:
ABBA, BAAB, ABAB, BABA, AABB, BBAA
And for blocks of six, the random numbers will be assigned the permutation BAABBA. To ensure allocation concealment, the randomization sequence will be prepared by a bio-statistician and placed in sequentially numbered, opaque, sealed envelopes. After obtaining written informed consent from each eligible participant, the next consecutively numbered envelope will be opened by the researcher according to the participant's order of enrollment, and the participant's group assignment will be revealed. Thus, the researcher will remain unaware of the upcoming allocation until the envelope is opened, thereby preventing prediction or manipulation of the allocation sequence. Again, each group will be divided into two subgroups of 16 and 17 people using a simple random method.