Over the decades, male condoms had been widely commercialized and used to protect against unintended pregnancy and sexually transmitted infections (STI). While natural rubber latex (NRL) male condoms has majority proportion of male condoms in the market, synthetic male condoms (SMC) made from polyurethane or other synthetic materials remain new to the consumers. Notably, synthetic male condoms are found to be more durable, non-allergenic and have better compatibility with lubricants when compared to NRL male condoms. The SMCs that have FDA approval and commercially available are AvantiTM (polyisoprene condom), Trojan SupraTM (polyurethane condom) and eZ.onTM (polyurethane condom). Although the effectiveness of SMCs in the prevention of sexually transmitted infections has yet to be established, SMCs are believed to be comparable to NRL male condoms in both STI prevention and contraception protection. Notwithstanding, a recent literature had reported the shortfall on the quality of variant male condoms in the market, especially nonconforming volumetric capacity, burst pressure and freedom from holes. This warrant the current investigation, to evaluate the functional performances of two newly invented synthetic male condoms, branded as "WONDALEAF-CAP" (WLC) and "WONDALEAF-ON-MAN" (WLM). Apart from being made of polyurethane, the major feature of WLC and WLM are nonetheless their adhesive coating on the outer rim of the condom opening which by securely adhering to the foreskin, prevent slippage of condom and spillage of male ejaculate or secretions when the penis is flaccid, and thereby improve the user-friendliness of condom usage.

Inclusion Criteria:

1. Their female sexual partners are not at risk of pregnancy (using alternate contraception);
2. They don't have known sexually transmitted infections, including HIV/AIDS;
3. They should be experienced condom users, minimum 10 male condoms used in the last 12 months;
4. They are between 18 to 45 years of age;
5. They are in a monogamous heterosexual relationship and agree to practice vaginal sex only using male condoms provided by the study.

Exclusion Criteria:

1. couples who work for the research team or who are close relatives of the research team;
2. men with known allergy to natural rubber latex;
3. men with known sensitivity to the residual chemicals used in the manufacture of natural rubber latex condoms or the test condom materials;
4. couples where one knowingly has a sexually transmitted infection.
5. couples who are pregnant in time of recruitment

Due to the nature of the studied intervention (male condom), only male respondents who fulfill the inclusion and exclusion criteria will be eligible for participation.

Throughout the study, neither participating couples, clinic staff, research assistants or researchers are masked to condom assignment as there are observable differences on packaging and design between the test condom (WLC and WLM) and the control condom (durex-Together). However, statisticians, sponsors, and medical reviewers are masked until completion of the final report to minimize biases potentially emerge during data analyses and results reporting.