Hi there. Am assuming you mean you had a 'threesome' ie the sex was a one time thing with these two girls or is it that you had sex with each separately on two different occasions? If you have no symptoms, then you dont have anything to worry about...especially as you say you 'know' these two girls & hence can ask them if they have had any prior history of STD's. There is no single test that will cover 'all' STD's. Since you have already done a test for HIV
, for your peace of mind, do a urine-routine test & an STS (VDRL/TPI/TPHA) for syphilis
& you may do a serum IgG
& IgM test for herpes
virus; chlamydia too but a touch more difficult to spot in males..serum tests all. Cheers & Good luck. I presume you have heard the adage 'spare the rod & spoil the child'..a similar analogy can be applied where your tryst with the condom is concerned!